diff --git a/minecart/README.md b/minecart/README.md
index 800c0e0..b2f440b 100644
--- a/minecart/README.md
+++ b/minecart/README.md
@@ -116,4 +116,5 @@ History
 2020-06-14  v1.06  API changed and chat command added  
 2020-06-27  v1.07  Route storage and cart command bugfixes  
 2020-07-24  V1.08  Adapted to new techage ICTA style  
-  
+2020-08-14  V1.09  Hopper support for digtron, protector:chest and default:furnace added    
+
diff --git a/minecart/depends.txt b/minecart/depends.txt
index a8e9b3e..923877d 100644
--- a/minecart/depends.txt
+++ b/minecart/depends.txt
@@ -1,3 +1,4 @@
 default
 carts
+screwdriver
 doc?
diff --git a/minecart/init.lua b/minecart/init.lua
index a7f7ac4..94a36c2 100644
--- a/minecart/init.lua
+++ b/minecart/init.lua
@@ -13,7 +13,7 @@
 minecart = {}
 
 -- Version for compatibility checks, see readme.md/history
-minecart.version = 1.08
+minecart.version = 1.09
 
 minecart.hopper_enabled = minetest.settings:get_bool("minecart_hopper_enabled") ~= false
 
@@ -31,6 +31,7 @@ dofile(MP.."/protection.lua")
 
 if minecart.hopper_enabled then
 	dofile(MP.."/hopper.lua")
+	dofile(MP.."/mods_support.lua")
 end
 dofile(MP.."/doc.lua")
 minetest.log("info", "[MOD] Minecart loaded")
diff --git a/minecart/lib.lua b/minecart/lib.lua
index da67ccc..d261e57 100644
--- a/minecart/lib.lua
+++ b/minecart/lib.lua
@@ -147,6 +147,8 @@ function minecart.take_items(pos, param2, num)
 	
 	if def and inv and def.take_listname and (not def.allow_take or def.allow_take(npos, nil, owner)) then
 		return minecart.inv_take_items(inv, def.take_listname, num)
+	elseif def and def.take_item then
+		return def.take_item(npos, num, owner)
 	else
 		local ndef = minetest.registered_nodes[node.name]
 		if ndef and ndef.minecart_hopper_takeitem then
@@ -166,6 +168,8 @@ function minecart.put_items(pos, param2, stack)
 		if leftover:get_count() > 0 then
 			return leftover
 		end
+	elseif def and def.put_item then
+		return def.put_item(npos, stack, owner)
 	elseif is_air_like(node.name) or check_cart_for_loading(npos) then
 		minetest.add_item(npos, stack)
 	else
@@ -191,8 +195,10 @@ function minecart.untake_items(pos, param2, stack)
 	local def = RegisteredInventories[node.name]
 	local inv = minetest.get_inventory({type="node", pos=npos})
 	
-	if def then
-		return inv and inv:add_item(def.put_listname, stack)
+	if def and inv and def.put_listname then
+		return inv:add_item(def.put_listname, stack)
+	elseif def and def.untake_item then
+		return def.untake_item(npos, stack)
 	else
 		local ndef = minetest.registered_nodes[node.name]
 		if ndef and ndef.minecart_hopper_untakeitem then
@@ -230,6 +236,9 @@ function minecart.register_inventory(node_names, def)
 			put_listname = def.put and def.put.listname,
 			allow_take = def.take and def.take.allow_inventory_take,
 			take_listname = def.take and def.take.listname,
+			put_item = def.put and def.put.put_item,
+			take_item = def.take and def.take.take_item,
+			untake_item = def.take and def.take.untake_item,
 		}
 	end
 end
@@ -272,32 +281,6 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
     return false
 end)
 
-minecart.register_inventory({"default:chest", "default:chest_open"}, {
-	put = {
-		listname = "main",
-	},
-	take = {
-		listname = "main",
-	},
-})
-
-minecart.register_inventory({"default:chest_locked", "default:chest_locked_open"}, {
-	put = {
-		allow_inventory_put = function(pos, stack, player_name)
-			local owner = M(pos):get_string("owner")
-			return owner == player_name
-		end, 
-		listname = "main",
-	},
-	take = {
-		allow_inventory_take = function(pos, stack, player_name)
-			local owner = M(pos):get_string("owner")
-			return owner == player_name
-		end, 
-		listname = "main",
-	},
-})
-
 minecart.register_inventory({"minecart:hopper"}, {
 	put = {
 		allow_inventory_put = function(pos, stack, player_name)
diff --git a/minecart/mods_support.lua b/minecart/mods_support.lua
new file mode 100644
index 0000000..14aaaa7
--- /dev/null
+++ b/minecart/mods_support.lua
@@ -0,0 +1,131 @@
+--[[
+
+	Minecart
+	========
+
+	Copyright (C) 2019-2020 Joachim Stolberg
+
+	MIT
+	See license.txt for more information
+	
+	Wrapper functions to get hopper support for other mods
+	
+]]--
+
+-- for lazy programmers
+local M = minetest.get_meta
+
+local CacheForFuelNodeNames = {}
+
+local function is_fuel(stack)
+	local name = stack:get_name()
+	if CacheForFuelNodeNames[name] then 
+		return true
+	end
+	if minetest.get_craft_result({method="fuel", width=1, items={stack}}).time ~= 0 then
+		CacheForFuelNodeNames[name] = true
+	end
+	return CacheForFuelNodeNames[name]
+end
+
+------------------------------------------------------------------------------
+-- default
+------------------------------------------------------------------------------
+
+minecart.register_inventory({"default:chest", "default:chest_open"}, {
+	put = {
+		listname = "main",
+	},
+	take = {
+		listname = "main",
+	},
+})
+
+minecart.register_inventory({"default:chest_locked", "default:chest_locked_open"}, {
+	put = {
+		allow_inventory_put = function(pos, stack, player_name)
+			local owner = M(pos):get_string("owner")
+			return owner == player_name
+		end, 
+		listname = "main",
+	},
+	take = {
+		allow_inventory_take = function(pos, stack, player_name)
+			local owner = M(pos):get_string("owner")
+			return owner == player_name
+		end, 
+		listname = "main",
+	},
+})
+
+minecart.register_inventory({"default:furnace", "default:furnace_active"}, {
+	put = {
+		-- distinguish between fuel and other items
+		put_item = function(pos, stack, player_name)
+			local inv = minetest.get_inventory({type="node", pos=pos})
+			local listname = is_fuel(stack) and "fuel" or "src"
+			local leftover = inv:add_item(listname, stack)
+			minetest.get_node_timer(pos):start(1.0)
+			if leftover:get_count() > 0 then
+				return leftover
+			end			
+		end, 
+	},
+	take = {
+		-- fuel can't be taken
+		listname = "dst",
+	},
+})
+
+------------------------------------------------------------------------------
+-- digtron
+------------------------------------------------------------------------------
+
+minecart.register_inventory({"digtron:inventory"}, {
+	put = {
+		listname = "main",
+	},
+	take = {
+		listname = "main",
+	},
+})
+
+minecart.register_inventory({"digtron:fuelstore"}, {
+	put = {
+		listname = "fuel",
+	},
+	take = {
+		listname = "fuel",
+	},
+})
+
+minecart.register_inventory({"digtron:combined_storage"}, {
+	put = {
+		-- distinguish between fuel and other items
+		put_item = function(pos, stack, player_name)
+			local inv = minetest.get_inventory({type="node", pos=pos})
+			local listname = is_fuel(stack) and "fuel" or "main"
+			local leftover = inv:add_item(listname, stack)
+			if leftover:get_count() > 0 then
+				return leftover
+			end			
+		end, 
+	},
+	take = {
+		-- fuel can't be taken
+		listname = "main",
+	},
+})
+
+------------------------------------------------------------------------------
+-- protector
+------------------------------------------------------------------------------
+
+minecart.register_inventory({"protector:chest"}, {
+	put = {
+		listname = "main",
+	},
+	take = {
+		listname = "main",
+	},
+})
diff --git a/signs_bot/cmd_flowers.lua b/signs_bot/cmd_flowers.lua
index e8003b6..3823311 100644
--- a/signs_bot/cmd_flowers.lua
+++ b/signs_bot/cmd_flowers.lua
@@ -32,18 +32,11 @@ function signs_bot.register_flower(name)
 end
 
 minetest.after(1, function()
-	for name,_ in pairs(minetest.registered_decorations) do
-		if type(name) == "string" then
+	for _,def in pairs(minetest.registered_decorations) do
+		local name = def.decoration
+		if name and type(name) == "string" then
 			local mod = string.split(name, ":")[1]
-			if mod == "flowers" then
-				signs_bot.register_flower(name)
-			end
-		end
-	end
-	for name,ndef in pairs(minetest.registered_nodes) do
-		if type(name) == "string" then
-			local mod = string.split(name, ":")[1]
-			if mod == "flowers" then
+			if mod == "flowers" or mod == "bakedclay" then -- Bakedclay also registers flowers as decoration.
 				signs_bot.register_flower(name)
 			end
 		end
diff --git a/signs_bot/interpreter.lua b/signs_bot/interpreter.lua
index 233afe6..bfd4c5a 100644
--- a/signs_bot/interpreter.lua
+++ b/signs_bot/interpreter.lua
@@ -147,12 +147,13 @@ end
 
 register_command("repeat", 1,
 	function(base_pos, mem, cnt)
-		mem.Stack[#mem.Stack + 1] = cnt
+		mem.Stack[#mem.Stack + 1] = tonumber(cnt)
 		mem.Stack[#mem.Stack + 1] = mem.pc + 1
 		return api.DONE
 	end,
 	function(cnt)
-		return cnt and cnt > 0 and cnt < 1000
+		cnt = tonumber(cnt) or 0
+		return cnt > 0 and cnt < 1000
 	end
 )	
 
diff --git a/signs_bot/techage.lua b/signs_bot/techage.lua
index 6aa7ee6..779f505 100644
--- a/signs_bot/techage.lua
+++ b/signs_bot/techage.lua
@@ -9,7 +9,8 @@ if minetest.get_modpath("techage") then
 	local Cable = techage.ElectricCable
 	local power = techage.power
 	
-	signs_bot.register_inventory({"techage:chest_ta2", "techage:chest_ta3", "techage:chest_ta4"}, {
+	signs_bot.register_inventory({"techage:chest_ta2", "techage:chest_ta3", "techage:chest_ta4",
+			"techage:ta3_silo", "techage:ta4_silo"}, {
 		allow_inventory_put = function(pos, stack, player_name)
 			return not minetest.is_protected(pos, player_name)
 		end, 
@@ -61,7 +62,7 @@ if minetest.get_modpath("techage") then
 			and minetest.registered_nodes[node.name].on_ignite then
 				minetest.registered_nodes[node.name].on_ignite(pos)
 			end
-			return true
+			return signs_bot.DONE
 		end,
 	})
 
diff --git a/techage/README.md b/techage/README.md
index 6bbdd8e..c99e3af 100644
--- a/techage/README.md
+++ b/techage/README.md
@@ -77,6 +77,21 @@ Available worlds will be converted to 'lsqlite3', but there is no way back, so:
 
 ### History
 
+**2020-09-13  V0.23**
+- Pull request #26: Digtron Battery: Fix duplication bug (from Thomas-S)
+- Improve ta4 sensor box
+- Firebox: Add check for free space when placing the node
+- Lua controller: Add 'get_gametime' function
+- Pull request #27: Liquid Tanks: Add protection support  (from Thomas-S)
+- Fix pump issue (silo source items can disappear)
+- Pull request #28: Quarry: Improve digging behaviour (from Thomas-S)
+- Pull request #28: Battery: Store battery load as metadata (from Thomas-S)
+- Pull request #29: Distributor: Keep item metadata (from Thomas-S)
+
+**2020-08-08  V0.22**
+- Pull request #25: Growlight: Improve flower registration (from Thomas-S)
+- Add tube support for digtron chests and protector:chest
+
 **2020-08-08  V0.21**
 - Pull request #18: Add a simple Digtron battery (from Thomas-S)
 - Pull request #23: Lua Controller: Fix $item_description() documentation and translation (from Thomas-S)
diff --git a/techage/basic_machines/consumer.lua b/techage/basic_machines/consumer.lua
index e7f1c95..e28937e 100644
--- a/techage/basic_machines/consumer.lua
+++ b/techage/basic_machines/consumer.lua
@@ -233,6 +233,7 @@ function techage.register_consumer(base_name, inv_name, tiles, tNode, validState
 				on_rightclick = tNode.on_rightclick,
 				after_place_node = after_place_node,
 				after_dig_node = after_dig_node,
+				preserve_metadata = tNode.preserve_metadata,
 				tubelib2_on_update2 = tubelib2_on_update2,
 				allow_metadata_inventory_put = tNode.allow_metadata_inventory_put,
 				allow_metadata_inventory_move = tNode.allow_metadata_inventory_move,
diff --git a/techage/basic_machines/distributor.lua b/techage/basic_machines/distributor.lua
index e4f9e27..ef06421 100644
--- a/techage/basic_machines/distributor.lua
+++ b/techage/basic_machines/distributor.lua
@@ -215,7 +215,7 @@ local function tubelib2_on_update2(pos, outdir, tlib2, node)
 	end
 end
 
-local function push_item(pos, filter, item_name, num_items, nvm)
+local function push_item(pos, filter, itemstack, num_items, nvm)
 	local idx = 1
 	local num_pushed = 0
 	local num_ports = #filter
@@ -226,7 +226,7 @@ local function push_item(pos, filter, item_name, num_items, nvm)
 		num_of_trials = num_of_trials + 1
 		local push_dir = filter[randidx[idx]]
 		local num_to_push = math.min(amount, num_items - num_pushed)
-		if techage.push_items(pos, push_dir, ItemStack(item_name.." "..num_to_push)) then
+		if techage.push_items(pos, push_dir, itemstack:peek_item(num_to_push)) then
 			num_pushed = num_pushed + num_to_push
 			nvm.port_counter[push_dir] = (nvm.port_counter[push_dir] or 0) + num_to_push
 		end
@@ -255,18 +255,19 @@ local function distributing(pos, inv, crd, nvm)
 		local item_name = stack:get_name()
 		local num_items = stack:get_count()
 		local num_to_push = math.min((nvm.num_items or crd.num_items) - sum_num_pushed, num_items)
+		local stack_to_push = stack:peek_item(num_to_push)
 		num_pushed = 0
 		
 		if item_filter[item_name] then
 			-- Push items based on filter
-			num_pushed = push_item(pos, item_filter[item_name], item_name, num_to_push, nvm)
+			num_pushed = push_item(pos, item_filter[item_name], stack_to_push, num_to_push, nvm)
 		elseif blocking_mode and #open_ports > 0 then
 			-- Push items based on open ports
-			num_pushed = push_item(pos, open_ports, item_name, num_to_push, nvm)
+			num_pushed = push_item(pos, open_ports, stack_to_push, num_to_push, nvm)
 		end
 		if not blocking_mode and num_pushed == 0 and #open_ports > 0 then
 			-- Push items based on open ports
-			num_pushed = push_item(pos, open_ports, item_name, num_to_push, nvm)
+			num_pushed = push_item(pos, open_ports, stack_to_push, num_to_push, nvm)
 		end
 			
 		sum_num_pushed = sum_num_pushed + num_pushed
diff --git a/techage/basic_machines/legacy_nodes.lua b/techage/basic_machines/legacy_nodes.lua
index c2e3aa9..a949afd 100644
--- a/techage/basic_machines/legacy_nodes.lua
+++ b/techage/basic_machines/legacy_nodes.lua
@@ -1,16 +1,14 @@
 --[[
 
-	Tube Library
-	============
+	TechAge
+	=======
 
-	Copyright (C) 2017 Joachim Stolberg
+	Copyright (C) 2019-2020 Joachim Stolberg
 
 	GPL v3
 	See LICENSE.txt for more information
-
-	legacy_nodes.lua:
 	
-	Tubelib support for chests and furnace
+	Tube support for default chests and furnace
 	
 ]]--
 
diff --git a/techage/basic_machines/mods_support.lua b/techage/basic_machines/mods_support.lua
new file mode 100644
index 0000000..ede4e25
--- /dev/null
+++ b/techage/basic_machines/mods_support.lua
@@ -0,0 +1,117 @@
+--[[
+
+	TechAge
+	=======
+
+	Copyright (C) 2019-2020 Joachim Stolberg
+
+	GPL v3
+	See LICENSE.txt for more information
+	
+	Tube support for digtron and protector chests
+	
+]]--
+
+
+-- for lazy programmers
+local M = minetest.get_meta
+
+local CacheForFuelNodeNames = {}
+
+local function is_fuel(stack)
+	local name = stack:get_name()
+	if CacheForFuelNodeNames[name] then 
+		return true
+	end
+	if minetest.get_craft_result({method="fuel", width=1, items={stack}}).time ~= 0 then
+		CacheForFuelNodeNames[name] = true
+	end
+	return CacheForFuelNodeNames[name]
+end
+
+------------------------------------------------------------------------------
+-- digtron
+------------------------------------------------------------------------------
+
+techage.register_node({"digtron:inventory"}, {
+	on_pull_item = function(pos, in_dir, num)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.get_items(pos, inv, "main", num)
+	end,
+	on_push_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "main", stack)
+	end,
+	on_unpull_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "main", stack)
+	end,
+})	
+
+techage.register_node({"digtron:fuelstore"}, {
+	on_pull_item = function(pos, in_dir, num)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.get_items(pos, inv, "fuel", num)
+	end,
+	on_push_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "fuel", stack)
+	end,
+	on_unpull_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "fuel", stack)
+	end,
+})	
+
+techage.register_node({"digtron:combined_storage"}, {
+	on_pull_item = function(pos, in_dir, num)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.get_items(pos, inv, "main", num)
+	end,
+	on_push_item = function(pos, side, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		minetest.get_node_timer(pos):start(1.0)
+		if is_fuel(stack) then
+			return techage.put_items(inv, "fuel", stack)
+		else
+			return techage.put_items(inv, "main", stack)
+		end
+	end,
+	on_unpull_item = function(pos, side, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "main", stack)
+	end,
+})	
+
+------------------------------------------------------------------------------
+-- protector
+------------------------------------------------------------------------------
+
+techage.register_node({"protector:chest"}, {
+	on_pull_item = function(pos, in_dir, num)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.get_items(pos, inv, "main", num)
+	end,
+	on_push_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "main", stack)
+	end,
+	on_unpull_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "main", stack)
+	end,
+})	
+
+
diff --git a/techage/basic_machines/quarry.lua b/techage/basic_machines/quarry.lua
index c7e6df1..ab938c7 100644
--- a/techage/basic_machines/quarry.lua
+++ b/techage/basic_machines/quarry.lua
@@ -157,23 +157,6 @@ local function mark_area(pos1, pos2, owner)
 	pos1.y = pos1.y - 0.2
 end
 
-local function peek_node(qpos)
-	local node = techage.get_node_lvm(qpos)
-	local ndef = minetest.registered_nodes[node.name]
-	if techage.can_node_dig(node, ndef) then
-		return techage.dropped_node(node, ndef)
-	end
-end
-
-local function add_to_inv(pos, item_name)
-	local inv = M(pos):get_inventory()
-	if inv:room_for_item("main", item_name) then
-		inv:add_item("main", item_name)
-		return true
-	end
-	return false
-end
-
 local function quarry_task(pos, crd, nvm)
 	nvm.start_level = nvm.start_level or 0
 	nvm.quarry_depth = nvm.quarry_depth or 1
@@ -182,6 +165,30 @@ local function quarry_task(pos, crd, nvm)
 	local y_last  = y_first - nvm.quarry_depth + 1
 	local facedir = minetest.get_node(pos).param2
 	local owner = M(pos):get_string("owner")
+	local fake_player = techage.Fake_player:new()
+	fake_player.get_pos = function (...)
+		return pos
+	end
+	fake_player.get_inventory = function(...)
+		return M(pos):get_inventory()
+	end
+
+	local add_to_inv = function(itemstacks)
+		local at_least_one_added = false
+		local inv = M(pos):get_inventory()
+		if #itemstacks == 0 then
+			return true
+		end
+		for _,stack in ipairs(itemstacks) do
+			if inv:room_for_item("main", stack) then
+				inv:add_item("main", stack)
+				at_least_one_added = true
+			elseif at_least_one_added then
+				minetest.add_item({x=pos.x,y=pos.y+1,z=pos.z}, stack)
+			end
+		end
+		return at_least_one_added
+	end
 	
 	local pos1, pos2 = get_corner_positions(pos, facedir, nvm.hole_diameter)
 	nvm.level = 1
@@ -203,14 +210,13 @@ local function quarry_task(pos, crd, nvm)
 			for zoffs = 1, nvm.hole_diameter do
 				for xoffs = 1, nvm.hole_diameter do
 					local qpos = get_quarry_pos(pos1, xoffs, zoffs)
-					local item_name = peek_node(qpos)
-					if item_name then
-						if add_to_inv(pos, item_name) then
-							minetest.remove_node(qpos)
-							crd.State:keep_running(pos, nvm, COUNTDOWN_TICKS)
-						else
-							crd.State:blocked(pos, nvm, S("inventory full"))
-						end
+					local dig_state = techage.dig_like_player(qpos, fake_player, add_to_inv)
+
+					if dig_state == techage.dig_states.INV_FULL then
+						crd.State:blocked(pos, nvm, S("inventory full"))
+						coroutine.yield()
+					elseif dig_state == techage.dig_states.DUG then
+						crd.State:keep_running(pos, nvm, COUNTDOWN_TICKS)
 						coroutine.yield()
 					end
 				end
@@ -229,7 +235,10 @@ local function keep_running(pos, elapsed)
 	
 	local nvm = techage.get_nvm(pos)
 	local crd = CRD(pos)
-	coroutine.resume(mem.co, pos, crd, nvm)
+	local _, err = coroutine.resume(mem.co, pos, crd, nvm)
+	if err then
+		minetest.log("error", "[TA4 Quarry Coroutine Error]" .. err)
+	end
 		
 	if techage.is_activeformspec(pos) then
 		M(pos):set_string("formspec", formspec(crd.State, pos, nvm))
diff --git a/techage/basis/assemble.lua b/techage/basis/assemble.lua
index 8a39207..45e09b4 100644
--- a/techage/basis/assemble.lua
+++ b/techage/basis/assemble.lua
@@ -81,7 +81,7 @@ local function check_space(pos, param2, AssemblyPlan, player_name)
 		
 		local node = techage.get_node_lvm(pos1)
 		local ndef = minetest.registered_nodes[node.name]
-		if not ndef or ndef.walkable and node.name ~= node_name then
+		if not ndef or not ndef.buildable_to and node.name ~= node_name then
 			minetest.chat_send_player(player_name, S("[TA] Not enough space!"))
 			return false
 		end
diff --git a/techage/basis/fake_player.lua b/techage/basis/fake_player.lua
new file mode 100644
index 0000000..e4a6f26
--- /dev/null
+++ b/techage/basis/fake_player.lua
@@ -0,0 +1,118 @@
+--[[
+
+	TechAge
+	=======
+
+	Copyright (C) 2019-2020 Joachim Stolberg
+	Copyright (C) 2020 Thomas S.
+
+	GPL v3
+	See LICENSE.txt for more information
+
+	Fake Player
+	
+]]--
+
+-- Map method names to their return values
+local methods = {
+	get_pos = { x = 0, y = 0, z = 0 },
+	set_pos = nil,
+	moveto = nil,
+	punch = nil,
+	right_click = nil,
+	get_hp = 20,
+	set_hp = nil,
+	get_inventory = nil,
+	get_wield_list = "",
+	get_wield_index = 0,
+	get_wielded_item = ItemStack(),
+	set_wielded_item = true,
+	set_armor_groups = nil,
+	get_armor_groups = {},
+	set_animation = nil,
+	get_animation = {},
+	set_animation_frame_speed = nil,
+	set_attach = nil,
+	get_attach = nil,
+	set_detach = nil,
+	get_bone_position = {},
+	set_properties = nil,
+	get_properties = {},
+	is_player = false,
+	get_nametag_attributes = {},
+	set_nametag_attributes = nil,
+	get_player_name = "",
+	get_player_velocity = nil,
+	add_player_velocity = nil,
+	get_look_dir = vector.new(0, 0, 1),
+	get_look_vertical = 0,
+	get_look_horizontal = 0,
+	set_look_vertical = nil,
+	set_look_horizontal = nil,
+	get_look_pitch = 0,
+	get_look_yaw = 0,
+	set_look_pitch = nil,
+	set_look_yaw = nil,
+	get_breath = 10,
+	set_breath = nil,
+	set_fov = nil,
+	get_fov = 0,
+	set_attribute = nil,
+	get_attribute = nil,
+	get_meta = nil,
+	set_inventory_formspec = nil,
+	get_inventory_formspec = "",
+	set_formspec_prepend = nil,
+	get_formspec_prepend = "",
+	get_player_control = {},
+	get_player_control_bits = 0,
+	set_physics_override = nil,
+	get_physics_override = {},
+	hud_add = 0,
+	hud_remove = nil,
+	hud_change = nil,
+	hud_get = {},
+	hud_set_flags = nil,
+	hud_get_flags = {},
+	hud_set_hotbar_itemcount = nil,
+	hud_get_hotbar_itemcount = 8,
+	hud_set_hotbar_image = nil,
+	hud_get_hotbar_image = "",
+	hud_set_hotbar_selected_image = nil,
+	hud_get_hotbar_selected_image = "",
+	set_sky = nil,
+	get_sky = {},
+	get_sky_color = {},
+	set_sun = nil,
+	get_sun = {},
+	set_moon = nil,
+	get_moon = {},
+	set_stars = nil,
+	get_stars = {},
+	set_clouds = nil,
+	get_clouds = {},
+	override_day_night_ratio = nil,
+	get_day_night_ratio = nil,
+	set_local_animation = nil,
+	get_local_animation = {},
+	set_eye_offset = nil,
+	get_eye_offset = {},
+	send_mapblock = nil,
+}
+
+techage.Fake_player = {}
+techage.Fake_player.__index = techage.Fake_player
+
+function techage.Fake_player:new()
+	local fake_player = {}
+	setmetatable(fake_player, techage.Fake_player)
+	return fake_player
+end
+
+
+for method_name, return_value in pairs(methods) do
+	techage.Fake_player[method_name] = function(self, ...)
+		return return_value
+	end
+end
+
diff --git a/techage/basis/firebox_lib.lua b/techage/basis/firebox_lib.lua
index a465807..294d2e6 100644
--- a/techage/basis/firebox_lib.lua
+++ b/techage/basis/firebox_lib.lua
@@ -118,3 +118,34 @@ function techage.firebox.has_fuel(pos)
 	local items = inv:get_stack("fuel", 1)
 	return items:get_count() > 0
 end
+
+function techage.firebox.is_free_position(pos, player_name)
+	local pos2 = techage.get_pos(pos, 'F')
+	if minetest.is_protected(pos2, player_name) then
+		minetest.chat_send_player(player_name, S("[TA] Area is protected!"))
+		return false
+	end
+	local node = techage.get_node_lvm(pos2)
+	local ndef = minetest.registered_nodes[node.name]
+	if not ndef or not ndef.buildable_to then
+		minetest.chat_send_player(player_name, S("[TA] Not enough space!"))
+		return false
+	end
+	return true
+end
+
+function techage.firebox.set_firehole(pos, on)
+	local param2 = techage.get_node_lvm(pos).param2
+	local pos2 = techage.get_pos(pos, 'F')
+	if on == true then
+		minetest.swap_node(pos2, {name="techage:coalfirehole_on", param2 = param2})
+	elseif on == false then
+		minetest.swap_node(pos2, {name="techage:coalfirehole", param2 = param2})
+	else
+		local node = techage.get_node_lvm(pos2)
+		if node.name == "techage:coalfirehole" or node.name == "techage:coalfirehole_on" then
+			minetest.swap_node(pos2, {name="air"})
+		end
+	end
+end	
+
diff --git a/techage/basis/lib.lua b/techage/basis/lib.lua
index 4f50747..9d954c4 100644
--- a/techage/basis/lib.lua
+++ b/techage/basis/lib.lua
@@ -140,7 +140,44 @@ function techage.can_node_dig(node, ndef)
 	-- add it to the white list
 	RegisteredNodesToBeDug[node.name] = true
 	return true
-end	
+end
+
+techage.dig_states = {
+	NOT_DIGGABLE = 1,
+	INV_FULL = 2,
+	DUG = 3
+}
+
+-- Digs a node like a player would by utilizing a fake player object.
+-- add_to_inv(itemstacks) is a method that should try to add the dropped stacks to an appropriate inventory.
+-- The node will only be dug, if add_to_inv(itemstacks) returns true.
+function techage.dig_like_player(pos, fake_player, add_to_inv)
+	local node = techage.get_node_lvm(pos)
+	local ndef = minetest.registered_nodes[node.name]
+	if not ndef or ndef.diggable == false or (ndef.can_dig and not ndef.can_dig(pos, fake_player)) then
+		return techage.dig_states.NOT_DIGGABLE
+	end
+	local drop_as_strings = minetest.get_node_drops(node)
+	local drop_as_stacks = {}
+	for _,itemstring in ipairs(drop_as_strings) do
+		drop_as_stacks[#drop_as_stacks+1] = ItemStack(itemstring)
+	end
+	local meta = M(pos)
+	if ndef.preserve_metadata then
+		ndef.preserve_metadata(pos, node, meta, drop_as_stacks)
+	end
+
+	if add_to_inv(drop_as_stacks) then
+		local oldmeta = meta:to_table()
+		minetest.remove_node(pos)
+
+		if ndef.after_dig_node then
+			ndef.after_dig_node(pos, node, oldmeta, fake_player)
+		end
+		return techage.dig_states.DUG
+	end
+	return techage.dig_states.INV_FULL
+end
 
 local function handle_drop(drop)
 	-- To keep it simple, return only the item with the lowest rarity
diff --git a/techage/basis/liquid_lib.lua b/techage/basis/liquid_lib.lua
index 1300857..6801070 100644
--- a/techage/basis/liquid_lib.lua
+++ b/techage/basis/liquid_lib.lua
@@ -203,6 +203,10 @@ local function empty_on_punch(pos, nvm, full_container, item_count)
 end
 
 function techage.liquid.on_punch(pos, node, puncher, pointed_thing)
+	if minetest.is_protected(pos, puncher:get_player_name()) then
+		return
+	end
+
 	local nvm = techage.get_nvm(pos)
 	local mem = techage.get_mem(pos)
 	mem.blocking_time = mem.blocking_time or 0
diff --git a/techage/basis/tubes.lua b/techage/basis/tubes.lua
index d3848ff..a31ef48 100644
--- a/techage/basis/tubes.lua
+++ b/techage/basis/tubes.lua
@@ -90,7 +90,7 @@ minetest.register_node("techage:tubeS", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	is_ground_content = false,
-	groups = {choppy=2, cracky=3, stone=1},
+	groups = {choppy=2, cracky=3},
 	sounds = default.node_sound_wood_defaults(),
 })
 
@@ -130,7 +130,7 @@ minetest.register_node("techage:tubeA", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	is_ground_content = false,
-	groups = {choppy=2, cracky=3, stone=1, not_in_creative_inventory=1},
+	groups = {choppy=2, cracky=3, not_in_creative_inventory=1},
 	sounds = default.node_sound_wood_defaults(),
 	drop = "techage:tubeS",
 })
diff --git a/techage/basis/tubes_ta4.lua b/techage/basis/tubes_ta4.lua
index 14bb6f0..0178c8f 100644
--- a/techage/basis/tubes_ta4.lua
+++ b/techage/basis/tubes_ta4.lua
@@ -57,7 +57,7 @@ minetest.register_node("techage:ta4_tubeS", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	is_ground_content = false,
-	groups = {choppy=2, cracky=3, stone=1},
+	groups = {choppy=2, cracky=3},
 	sounds = default.node_sound_wood_defaults(),
 })
 
@@ -97,7 +97,7 @@ minetest.register_node("techage:ta4_tubeA", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	is_ground_content = false,
-	groups = {choppy=2, cracky=3, stone=1, not_in_creative_inventory=1},
+	groups = {choppy=2, cracky=3, not_in_creative_inventory=1},
 	sounds = default.node_sound_wood_defaults(),
 	drop = "techage:ta4_tubeS",
 })
diff --git a/techage/coal_power_station/firebox.lua b/techage/coal_power_station/firebox.lua
index 70547ac..467c05e 100644
--- a/techage/coal_power_station/firebox.lua
+++ b/techage/coal_power_station/firebox.lua
@@ -22,18 +22,6 @@ local firebox = techage.firebox
 local CYCLE_TIME = 2
 local BURN_CYCLE_FACTOR = 0.5
 
-local function firehole(pos, on)
-	local param2 = techage.get_node_lvm(pos).param2
-	local pos2 = techage.get_pos(pos, 'F')
-	if on == true then
-		minetest.swap_node(pos2, {name="techage:coalfirehole_on", param2 = param2})
-	elseif on == false then
-		minetest.swap_node(pos2, {name="techage:coalfirehole", param2 = param2})
-	else
-		minetest.swap_node(pos2, {name="air"})
-	end
-end	
-
 local function node_timer(pos, elapsed)
 	local nvm = techage.get_nvm(pos)
 	local power = techage.transfer(
@@ -52,7 +40,7 @@ local function node_timer(pos, elapsed)
 			nvm.burn_cycles_total = nvm.burn_cycles
 		else
 			nvm.running = false
-			firehole(pos, false)
+			firebox.set_firehole(pos, false)
 			M(pos):set_string("formspec", firebox.formspec(nvm))
 			return false
 		end
@@ -67,7 +55,7 @@ local function start_firebox(pos, nvm)
 	if not nvm.running then
 		nvm.running = true
 		node_timer(pos, 0)
-		firehole(pos, true)
+		firebox.set_firehole(pos, true)
 		minetest.get_node_timer(pos):start(CYCLE_TIME)
 	end
 end
@@ -96,20 +84,25 @@ minetest.register_node("techage:coalfirebox", {
 	allow_metadata_inventory_take = firebox.allow_metadata_inventory_take,
 	on_rightclick = firebox.on_rightclick,
 	
-	on_construct = function(pos)
-		techage.add_node(pos, "techage:coalfirebox")
-		local nvm = techage.get_nvm(pos)
-		nvm.running = false
-		nvm.burn_cycles = 0
-		local meta = M(pos)
-		meta:set_string("formspec", firebox.formspec(nvm))
-		local inv = meta:get_inventory()
-		inv:set_size('fuel', 1)
-		firehole(pos, false)
+	after_place_node = function(pos, placer)
+		if firebox.is_free_position(pos, placer:get_player_name()) then
+			techage.add_node(pos, "techage:coalfirebox")
+			local nvm = techage.get_nvm(pos)
+			nvm.running = false
+			nvm.burn_cycles = 0
+			local meta = M(pos)
+			meta:set_string("formspec", firebox.formspec(nvm))
+			local inv = meta:get_inventory()
+			inv:set_size('fuel', 1)
+			firebox.set_firehole(pos, false)
+		else
+			minetest.remove_node(pos)
+			return true
+		end
 	end,
 
 	on_destruct = function(pos)
-		firehole(pos, nil)
+		firebox.set_firehole(pos, nil)
 	end,
 
 	on_metadata_inventory_put = function(pos, listname, index, stack, player)
diff --git a/techage/coal_power_station/oilfirebox.lua b/techage/coal_power_station/oilfirebox.lua
index 6c45912..7de649b 100644
--- a/techage/coal_power_station/oilfirebox.lua
+++ b/techage/coal_power_station/oilfirebox.lua
@@ -25,18 +25,6 @@ local liquid = techage.liquid
 local CYCLE_TIME = 2
 local BURN_CYCLE_FACTOR = 0.5
 
-local function firehole(pos, on)
-	local param2 = techage.get_node_lvm(pos).param2
-	local pos2 = techage.get_pos(pos, 'F')
-	if on == true then
-		minetest.swap_node(pos2, {name="techage:coalfirehole_on", param2 = param2})
-	elseif on == false then
-		minetest.swap_node(pos2, {name="techage:coalfirehole", param2 = param2})
-	else
-		minetest.swap_node(pos2, {name="air"})
-	end
-end	
-
 local function node_timer(pos, elapsed)
 	local nvm = techage.get_nvm(pos)
 	local power = techage.transfer(
@@ -55,7 +43,7 @@ local function node_timer(pos, elapsed)
 			nvm.burn_cycles_total = nvm.burn_cycles
 		else
 			nvm.running = false
-			firehole(pos, false)
+			firebox.set_firehole(pos, false)
 			M(pos):set_string("formspec", fuel.formspec(nvm))
 			return false
 		end
@@ -70,7 +58,7 @@ local function start_firebox(pos, nvm)
 	if not nvm.running and fuel.has_fuel(nvm) then
 		nvm.running = true
 		node_timer(pos, 0)
-		firehole(pos, true)
+		firebox.set_firehole(pos, true)
 		minetest.get_node_timer(pos):start(CYCLE_TIME)
 	end
 end
@@ -98,21 +86,26 @@ minetest.register_node("techage:oilfirebox", {
 	on_rightclick = fuel.on_rightclick,
 	on_receive_fields = fuel.on_receive_fields,
 	
-	on_construct = function(pos)
-		techage.add_node(pos, "techage:oilfirebox")
-		local nvm = techage.get_nvm(pos)
-		nvm.running = false
-		nvm.burn_cycles = 0
-		nvm.liquid = {}
-		nvm.liquid.amount =  0
-		local meta = M(pos)
-		meta:set_string("formspec", fuel.formspec(nvm))
-		local inv = meta:get_inventory()
-		firehole(pos, false)
+	after_place_node = function(pos, placer)
+		if firebox.is_free_position(pos, placer:get_player_name()) then
+			techage.add_node(pos, "techage:oilfirebox")
+			local nvm = techage.get_nvm(pos)
+			nvm.running = false
+			nvm.burn_cycles = 0
+			nvm.liquid = {}
+			nvm.liquid.amount =  0
+			local meta = M(pos)
+			meta:set_string("formspec", fuel.formspec(nvm))
+			local inv = meta:get_inventory()
+			firebox.set_firehole(pos, false)
+		else
+			minetest.remove_node(pos)
+			return true
+		end
 	end,
-
+	
 	on_destruct = function(pos)
-		firehole(pos, nil)
+		firebox.set_firehole(pos, nil)
 	end,
 
 	on_punch = function(pos, node, puncher, pointed_thing)
diff --git a/techage/digtron/battery.lua b/techage/digtron/battery.lua
index ba09deb..4763f5e 100644
--- a/techage/digtron/battery.lua
+++ b/techage/digtron/battery.lua
@@ -140,27 +140,21 @@ techage.register_consumer("digtron_battery", S("Digtron Battery"), { act = tiles
 			end
 		end
 	end,
-	after_dig_node = function(pos, oldnode, oldmetadata, digger)
-		local node = ItemStack(oldnode.name)
-		if oldmetadata.inventory then
-			local total = count_coal(oldmetadata)
-			local meta = node:get_meta()
+	preserve_metadata = function(pos, oldnode, oldmetadata, drops)
+		local metadata = M(pos):to_table()
+		if metadata.inventory then
+			local total = count_coal(metadata)
+			local meta = drops[1]:get_meta()
 			meta:set_int("coal", total)
 			local text = S("Digtron Battery").." ("..math.floor(total/TOTAL_MAX * 100).." %)"
 			meta:set_string("description", text)
 		end
-		local inv = minetest.get_inventory({type="player", name=digger:get_player_name()})
-		local left_over = inv:add_item("main", node)
-		if left_over:get_count() > 0 then
-			minetest.add_item(pos, node)
-		end
 	end,
 	on_rightclick = function(pos, node, clicker)
 		techage.set_activeformspec(pos, clicker)
 		local nvm = techage.get_nvm(pos)
 		M(pos):set_string("formspec", formspec(CRD(pos).State, pos, nvm))
 	end,
-	drop = "",
 	node_timer = keep_running,
 	on_receive_fields = on_receive_fields,
 	allow_metadata_inventory_put = allow_metadata_inventory_put,
diff --git a/techage/doc/manual_DE.lua b/techage/doc/manual_DE.lua
index 016c02f..6039266 100644
--- a/techage/doc/manual_DE.lua
+++ b/techage/doc/manual_DE.lua
@@ -1340,7 +1340,16 @@ techage.manual_DE.aText = {
   "\n"..
   "\n"..
   "\n",
-  "Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten. Sie hat erweitere Kommandos zur Fernsteuerung.\n"..
+  "Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten in Verbindung mit dem Lua Controller.\n"..
+  "Wird etwas in die Kiste gelegt\\, oder entnommen\\, oder eine der Tasten \"F1\"/\"F2\" gedrückt\\, so wird ein Event-Signal an den Lua Controller gesendet.\n"..
+  "Die Sensor Kiste unterstützt folgende Kommandos:\n"..
+  "\n"..
+  "  - Über 'state = $read_data(<num>\\, \"state\")' kann der Status der Kiste abgefragt werden. Mögliche Antworten sind: \"empty\"\\, \"loaded\"\\, \"full\"\n"..
+  "  - Über 'name\\, action = $read_data(<num>\\, \"action\")' kann die letzte Spieleraktion abgefragt werden. 'name' ist der Spielername\\, Als 'action' wird zurückgeliefert: \"put\"\\, \"take\"\\, \"f1\"\\, \"f2\".\n"..
+  "  - Über 'stacks = $read_data(<num>\\, \"stacks\")' kann der Inhalt der Kiste ausgelesen werden. Siehe dazu: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest\n"..
+  "  - Über '$send_cmnd(<num>\\, \"text\"\\, \"press both buttons andnput something into the chest\")' kann der Text im Menü der Sensor Kiste gesetzt werden.\n"..
+  "\n"..
+  "Über die Checkbox \"Erlaube öffentlichen Zugriff\" kann eingestellt werden\\, ob die Kiste von jedem genutzt werden darf\\, oder nur von Spielern die hier Zugriffsrechte haben.\n"..
   "\n"..
   "\n"..
   "\n",
diff --git a/techage/doc/manual_EN.lua b/techage/doc/manual_EN.lua
index 81533c6..3473f67 100644
--- a/techage/doc/manual_EN.lua
+++ b/techage/doc/manual_EN.lua
@@ -1331,7 +1331,16 @@ techage.manual_EN.aText = {
   "\n"..
   "\n"..
   "\n",
-  "The TA4 sensor box is used to set up automatic warehouses or vending machines. It has additional commands for remote control.\n"..
+  "The TA4 sensor box is used to set up automatic warehouses or vending machines in conjunction with the Lua controller.\n"..
+  "If something is put into the box or removed\\, or one of the \"F1\" / \"F2\" keys is pressed\\, an event signal is sent to the Lua controller.\n"..
+  "The sensor box supports the following commands:\n"..
+  "\n"..
+  "  - The status of the box can be queried via 'state = $read_data(<num>\\, \"state\")'. Possible answers are: \"empty\"\\, \"loaded\"\\, \"full\"\n"..
+  "  - The last player action can be queried via 'name\\, action = $read_data(<num>\\, \"action\")'. 'name' is the player name. One of the following is returned as 'action': \"put\"\\, \"take\"\\, \"f1\"\\, \"f2\".\n"..
+  "  - The contents of the box can be read out via 'stacks = $read_data(<num>\\, \"stacks\")'. See: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest\n"..
+  "  - Via '$send_cmnd(<num>\\, \"text\"\\, \"press both buttons andnput something into the chest\")' the text can be set in the menu of the sensor box.\n"..
+  "\n"..
+  "The checkbox \"Allow public chest access\" can be used to set whether the box can be used by everyone or only by players who have access/protection rights here.\n"..
   "\n"..
   "\n"..
   "\n",
@@ -1417,8 +1426,8 @@ techage.manual_EN.aText = {
   "\n"..
   "The TA4 pusher has two additional commands for the Lua controller:\n"..
   "\n"..
-  "  - 'config' is used to configure the pusher\\, analogous to manual configuration via the menu.\nExample: '$ send_cmnd(1234\\, \"config\"\\, \"default: dirt\")'\n"..
-  "  - 'pull' is used to send an order to the pusher:\nExample: '$ send_cmnd(1234\\, \"pull\"\\, \"default: dirt 8\")'\nValues ​​from 1 to 12 are permitted as numbers. Then the pusher goes back to 'stopped' mode and sends an\" off \"command back to the transmitter of the\" pull \"command.\n"..
+  "  - 'config' is used to configure the pusher\\, analogous to manual configuration via the menu.\nExample: '$send_cmnd(1234\\, \"config\"\\, \"default: dirt\")'\n"..
+  "  - 'pull' is used to send an order to the pusher:\nExample: '$send_cmnd(1234\\, \"pull\"\\, \"default: dirt 8\")'\nValues ​​from 1 to 12 are permitted as numbers. Then the pusher goes back to 'stopped' mode and sends an\" off \"command back to the transmitter of the\" pull \"command.\n"..
   "\n"..
   "\n"..
   "\n",
@@ -1449,7 +1458,7 @@ techage.manual_EN.aText = {
   "\n"..
   "The chest has an additional command for the Lua controller:\n"..
   "\n"..
-  "  - 'count' is used to request how many items are in the chest.\nExample 1: '$ read_data(CHEST\\, \"count\")' -> Sum of items across all 8 stores\nExample 2: '$ read_data(CHEST\\, \"count\"\\, 2)' -> number of items in store 2 (second from left)\n"..
+  "  - 'count' is used to request how many items are in the chest.\nExample 1: '$read_data(CHEST\\, \"count\")' -> Sum of items across all 8 stores\nExample 2: '$read_data(CHEST\\, \"count\"\\, 2)' -> number of items in store 2 (second from left)\n"..
   "\n"..
   "\n"..
   "\n",
diff --git a/techage/icta_controller/battery.lua b/techage/icta_controller/battery.lua
index fa59f1d..7d3f262 100644
--- a/techage/icta_controller/battery.lua
+++ b/techage/icta_controller/battery.lua
@@ -15,7 +15,6 @@
  -- for lazy programmers
 local M = minetest.get_meta
 local S = techage.S
-local logic = techage.logic
 local BATTERY_CAPACITY = 10000000
 
 local function calc_percent(content)
@@ -36,73 +35,69 @@ local function on_timer(pos, elapsed)
 	return true
 end
 
-local function register_battery(ext, percent, nici)
-	minetest.register_node("techage:ta4_battery"..ext, {
-		description = S("Battery").." "..ext,
-		inventory_image = 'techage_battery_inventory.png',
-		wield_image = 'techage_battery_inventory.png',
-		tiles = {
-			-- up, down, right, left, back, front
-			"techage_smartline.png",
-			"techage_smartline.png",
-			"techage_smartline.png",
-			"techage_smartline.png",
-			"techage_smartline.png",
-			"techage_smartline.png^techage_battery_green.png",
-		},
+minetest.register_alias("techage:ta4_battery75", "techage:ta4_battery")
+minetest.register_alias("techage:ta4_battery50", "techage:ta4_battery")
+minetest.register_alias("techage:ta4_battery25", "techage:ta4_battery")
 
-		drawtype = "nodebox",
-		node_box = {
-			type = "fixed",
-			fixed = {
-				{ -6/32, -6/32, 14/32,  6/32,  6/32, 16/32},
-			},
+minetest.register_node("techage:ta4_battery", {
+	description = S("Battery"),
+	inventory_image = 'techage_battery_inventory.png',
+	wield_image = 'techage_battery_inventory.png',
+	tiles = {
+		-- up, down, right, left, back, front
+		"techage_smartline.png",
+		"techage_smartline.png",
+		"techage_smartline.png",
+		"techage_smartline.png",
+		"techage_smartline.png",
+		"techage_smartline.png^techage_battery_green.png",
+	},
+
+	drawtype = "nodebox",
+	node_box = {
+		type = "fixed",
+		fixed = {
+			{ -6/32, -6/32, 14/32,  6/32,  6/32, 16/32},
 		},
-		
-		after_place_node = function(pos, placer)
-			local meta = minetest.get_meta(pos)
-			meta:set_int("content", BATTERY_CAPACITY * percent)
-			local node = minetest.get_node(pos)
-			node.name = "techage:ta4_battery"
-			minetest.swap_node(pos, node)
-			on_timer(pos, 1)
-			minetest.get_node_timer(pos):start(30)
-		end,
-		
-		on_timer = on_timer,
-		
-		after_dig_node = function(pos, oldnode, oldmetadata, digger)
-			local percent = calc_percent(tonumber(oldmetadata.fields.content))
-			local stack
-			if percent > 95 then
-				stack = ItemStack("techage:ta4_battery")
-			elseif percent > 75 then
-				stack = ItemStack("techage:ta4_battery75")
-			elseif percent > 50 then
-				stack = ItemStack("techage:ta4_battery50")
-			elseif percent > 25 then
-				stack = ItemStack("techage:ta4_battery25")
-			else
-				return
+	},
+
+	after_place_node = function(pos, placer, itemstack)
+		local content = BATTERY_CAPACITY
+		if itemstack then
+			local stack_meta = itemstack:get_meta()
+			if stack_meta then
+				-- This ensures that dug batteries of the old system are considered full.
+				local string_content = stack_meta:get_string("content")
+				if string_content ~= "" then
+					-- Batteries dug in the new system are handled correctly.
+					content = techage.in_range(stack_meta:get_int("content"), 0, BATTERY_CAPACITY)
+				end
 			end
-			local inv = minetest.get_inventory({type="player", name=digger:get_player_name()})
-			inv:add_item("main", stack)
-		end,
+		end
+		M(pos):set_int("content", content)
+		on_timer(pos, 1)
+		minetest.get_node_timer(pos):start(30)
+	end,
 
-		paramtype = "light",
-		sunlight_propagates = true,
-		paramtype2 = "facedir",
-		groups = {choppy=1, cracky=1, crumbly=1, not_in_creative_inventory=nici},
-		drop = "",
-		is_ground_content = false,
-		sounds = default.node_sound_stone_defaults(),
-	})
-end
+	on_timer = on_timer,
 
-register_battery("", 1.0, 0)
-register_battery("75", 0.75, 1)
-register_battery("50", 0.5, 1)
-register_battery("25", 0.25, 1)
+	preserve_metadata = function(pos, oldnode, oldmetadata, drops)
+		local content = M(pos):get_int("content")
+
+		local meta = drops[1]:get_meta()
+		meta:set_int("content", content)
+		local percent = calc_percent(content)
+		local text = S("Digtron Battery").." ("..percent.." %)"
+		meta:set_string("description", text)
+	end,
+
+	paramtype = "light",
+	sunlight_propagates = true,
+	paramtype2 = "facedir",
+	groups = {choppy=1, cracky=1, crumbly=1},
+	is_ground_content = false,
+	sounds = default.node_sound_stone_defaults(),
+})
 
 minetest.register_node("techage:ta4_battery_empty", {
 	description = S("Battery"),
@@ -159,8 +154,7 @@ else
 	})
 end
 
-techage.register_node({"techage:ta4_battery", "techage:ta4_battery25", 
-		"techage:ta4_battery50", "techage:ta4_battery75"}, 
+techage.register_node({"techage:ta4_battery"},
 	{
 		on_node_load = function(pos)
 			minetest.get_node_timer(pos):start(30)
diff --git a/techage/init.lua b/techage/init.lua
index ef8b2a1..f87a45e 100644
--- a/techage/init.lua
+++ b/techage/init.lua
@@ -13,7 +13,7 @@
 techage = {}
 
 -- Version for compatibility checks, see readme.md/history
-techage.version = 0.21
+techage.version = 0.23
 
 if minetest.global_exists("tubelib") then
 	minetest.log("error", "[techage] Techage can't be used together with the mod tubelib!")
@@ -66,6 +66,7 @@ end
 -- Basis features
 local MP = minetest.get_modpath("techage")
 dofile(MP.."/basis/lib.lua")  -- helper functions
+dofile(MP.."/basis/fake_player.lua")  -- dummy player object
 dofile(MP.."/basis/node_store.lua")
 dofile(MP.."/basis/gravel_lib.lua")  -- ore probability
 dofile(MP.."/basis/node_states.lua") -- state model
@@ -144,6 +145,7 @@ dofile(MP.."/basic_machines/consumer.lua")  -- consumer base model
 dofile(MP.."/basic_machines/source.lua")
 dofile(MP.."/basic_machines/pusher.lua")
 dofile(MP.."/basic_machines/legacy_nodes.lua")
+dofile(MP.."/basic_machines/mods_support.lua")
 dofile(MP.."/basic_machines/grinder.lua")
 dofile(MP.."/basic_machines/distributor.lua")
 dofile(MP.."/basic_machines/gravelsieve.lua")
diff --git a/techage/items/hydrogen.lua b/techage/items/hydrogen.lua
index c64c4a6..160d61a 100644
--- a/techage/items/hydrogen.lua
+++ b/techage/items/hydrogen.lua
@@ -17,6 +17,7 @@ local S = techage.S
 minetest.register_craftitem("techage:hydrogen", {
 	description = S("TA4 Hydrogen"),
 	inventory_image = "techage_hydrogen_inv.png",
+	groups = {ta_liquid = 1},	
 })
 
 minetest.register_craftitem("techage:cylinder_small_hydrogen", {
diff --git a/techage/items/lye.lua b/techage/items/lye.lua
index 50f2922..ec401ca 100644
--- a/techage/items/lye.lua
+++ b/techage/items/lye.lua
@@ -17,6 +17,7 @@ local S = techage.S
 minetest.register_craftitem("techage:lye", {
 	description = S("Lye"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#7fd44c:120^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:barrel_lye", {
diff --git a/techage/items/oil.lua b/techage/items/oil.lua
index a36ff1a..1db905f 100644
--- a/techage/items/oil.lua
+++ b/techage/items/oil.lua
@@ -58,7 +58,7 @@ minetest.register_node("techage:oil_source", {
     liquid_range = 10,
 	liquid_renewable = false,
 	post_effect_color = {a = 200, r = 1, g = 1, b = 1},
-	groups = {liquid = 5},
+	groups = {liquid = 5, ta_liquid = 1},
 })
 
 minetest.register_node("techage:oil_flowing", {
diff --git a/techage/items/petroleum.lua b/techage/items/petroleum.lua
index 463bd78..2cb38a4 100644
--- a/techage/items/petroleum.lua
+++ b/techage/items/petroleum.lua
@@ -18,26 +18,31 @@ local S = techage.S
 minetest.register_craftitem("techage:bitumen", {
 	description = S("TA3 Bitumen"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#000000",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:fueloil", {
 	description = S("TA3 Fuel Oil"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#7E5D0A:180^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:naphtha", {
 	description = S("TA3 Naphtha"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#AAA820:180^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:gasoline", {
 	description = S("TA3 Gasoline"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#EEFC52:180^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:gas", {
 	description = S("TA3 Propane"),
 	inventory_image = "techage_gas_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:ta3_cylinder_small_gas", {
diff --git a/techage/lamps/growlight.lua b/techage/lamps/growlight.lua
index 8d35369..6938f99 100644
--- a/techage/lamps/growlight.lua
+++ b/techage/lamps/growlight.lua
@@ -138,10 +138,11 @@ function techage.register_plant(name)
 end
 
 minetest.after(1, function()
-	for name,_ in pairs(minetest.registered_decorations) do
-		if type(name) == "string" then
+	for _,def in pairs(minetest.registered_decorations) do
+		local name = def.decoration
+		if name and type(name) == "string" then
 			local mod = string.split(name, ":")[1]
-			if mod == "flowers" then
+			if mod == "flowers" or mod == "bakedclay" then -- Bakedclay also registers flowers as decoration.
 				techage.register_flower(name)
 			end
 		end
@@ -149,12 +150,8 @@ minetest.after(1, function()
 	for name,ndef in pairs(minetest.registered_nodes) do
 		if type(name) == "string" then
 			local mod = string.split(name, ":")[1]
-			if mod == "farming" then
-				if ndef.on_timer then -- probably a plant that still needs to grow
-					techage.register_plant(name)
-				end
-			elseif mod == "flowers" then
-				techage.register_flower(name)
+			if mod == "farming" and ndef.on_timer then -- probably a plant that still needs to grow
+				techage.register_plant(name)
 			end
 		end
 	end
diff --git a/techage/liquids/node_api.lua b/techage/liquids/node_api.lua
index 1c4eb1c..7a6484c 100644
--- a/techage/liquids/node_api.lua
+++ b/techage/liquids/node_api.lua
@@ -162,6 +162,17 @@ function liquid.take(pos, outdir, name, amount, player_name)
 	return taken, item_name
 end
 
+function liquid.untake(pos, outdir, name, amount, player_name)
+	for _,item in ipairs(get_network_table(pos, outdir, "tank")) do
+		local liquid = LQD(item.pos)
+		if liquid and liquid.untake then
+			amount = liquid.untake(item.pos, item.indir, name, amount)
+			if not amount or amount == 0 then break end
+		end
+	end
+	return amount or 0
+end
+
 --
 -- Server local functions
 --
diff --git a/techage/liquids/pump.lua b/techage/liquids/pump.lua
index e8081b7..a01c36e 100644
--- a/techage/liquids/pump.lua
+++ b/techage/liquids/pump.lua
@@ -70,7 +70,7 @@ local function pumping(pos, nvm, state, capa)
 	if taken > 0 then
 		local leftover = liquid.put(pos, outdir, name, taken, starter)
 		if leftover and leftover == taken then
-			liquid.put(pos, Flip[outdir], name, leftover)
+			liquid.untake(pos, Flip[outdir], name, leftover)
 			state:blocked(pos, nvm)
 			return
 		end
diff --git a/techage/liquids/silo.lua b/techage/liquids/silo.lua
index 7087050..617bbfe 100644
--- a/techage/liquids/silo.lua
+++ b/techage/liquids/silo.lua
@@ -26,9 +26,10 @@ local function allow_metadata_inventory_put(pos, listname, index, stack, player)
 	if minetest.is_protected(pos, player:get_player_name()) then
 		return 0
 	end
-	-- check if it is powder
-	local ndef = minetest.registered_craftitems[stack:get_name()] or {}
-	if ndef.groups and ndef.groups.powder == 1 then
+	-- check if it is powder or techage liquid item (migration function)
+	local ndef = minetest.registered_craftitems[stack:get_name()] or 
+			minetest.registered_items[stack:get_name()] or {}
+	if ndef.groups and (ndef.groups.powder == 1 or ndef.groups.ta_liquid == 1) then
 		local nvm = techage.get_nvm(pos)
 		nvm.item_name = nil
 		local inv = minetest.get_meta(pos):get_inventory()
@@ -125,6 +126,15 @@ local tLiquid = {
 		end
 		return 0
 	end,
+	untake = function(pos, indir, name, amount)
+		local inv = M(pos):get_inventory()
+		local stack = ItemStack(name.." "..amount)
+		if inv:room_for_item("main", stack) then
+			inv:add_item("main", stack)
+			return 0
+		end
+		return amount
+	end,
 }
 
 local tNetworks = {
diff --git a/techage/liquids/tank.lua b/techage/liquids/tank.lua
index 9663653..9144add 100644
--- a/techage/liquids/tank.lua
+++ b/techage/liquids/tank.lua
@@ -67,6 +67,15 @@ local function put_liquid(pos, indir, name, amount)
 	return amount
 end
 
+local function untake_liquid(pos, indir, name, amount)
+	local leftover = liquid.srv_put(pos, indir, name, amount)
+	if techage.is_activeformspec(pos) then
+		local nvm = techage.get_nvm(pos)
+		M(pos):set_string("formspec", liquid.formspec(pos, nvm))
+	end
+	return leftover
+end
+
 local networks_def = {
 	pipe2 = {
 		sides = techage.networks.AllSides, -- Pipe connection sides
@@ -110,6 +119,7 @@ minetest.register_node("techage:ta3_tank", {
 		peek = liquid.srv_peek,
 		put = put_liquid,
 		take = take_liquid,
+		untake = untake_liquid,
 	},
 	networks = networks_def,
 	on_rightclick = on_rightclick,
@@ -168,6 +178,7 @@ minetest.register_node("techage:oiltank", {
 		peek = liquid.srv_peek,
 		put = put_liquid,
 		take = take_liquid,
+		untake = untake_liquid,
 	},
 	networks = networks_def,
 	on_rightclick = on_rightclick,
@@ -216,6 +227,7 @@ minetest.register_node("techage:ta4_tank", {
 		peek = liquid.srv_peek,
 		put = put_liquid,
 		take = take_liquid,
+		untake = untake_liquid,
 	},
 	networks = networks_def,
 	on_rightclick = on_rightclick,
diff --git a/techage/locale/techage.de.tr b/techage/locale/techage.de.tr
index fce382b..21ae9dc 100644
--- a/techage/locale/techage.de.tr
+++ b/techage/locale/techage.de.tr
@@ -1,10 +1,10 @@
 # textdomain: techage
 
- ku is needed!)= ku wird benötigt!)
 #### TA3 Terminal ####@n@nSend commands to your machines@nand output text messages from your@nmachines to the Terminal.@n@nCommand syntax:@n  cmd <num> <cmnd>@n@nexample: cmd 181 on@n<num> is the number of the node to which the command is sent@n'on' is the command to turn machines/nodes on@nFurther commands can be retrieved by clicking on@nmachines/nodes with the Techage Info Tool.@n@nLocal commands:@n- clear    @= clear screen@n- help     @= this message@n- pub      @= switch to public use@n- priv      @= switch to private use@nTo program a user button with a command:@n  set <button-num> <button-text> <command>@ne.g. 'set 1 ON cmd 123 on'@n=
 Accu Box=Akkublock
 Active:=Aktiv:
 All nodes:=Alle Blöcke:
+Allow public chest access=Erlaube öffentlichen Zugriff
 Allow to dig/place Techage power lines nearby power poles=Erlaubt TODO
 Aluminum=Aluminium
 Area already loaded or max. number of Forceload Blocks reached!=Bereich bereits geladen oder maximale Anzahl von Forceload Blöcken erreicht!
@@ -429,6 +429,7 @@ inlet/pipe error=Einlass/Röhrenfehler
 inventory full=Inventar ist voll
 item output blocked=Ausgang blockiert
 keep assignment=Zuordnung beibehalten
+ku is needed=ku wird benötigt
 light=Licht
 loaded=geladen
 needs power=benötigt Strom
@@ -453,3 +454,4 @@ water temperature=Wassertemperatur
 wrong catalyst=falscher Katalysator
 wrong storage diameter=Falscher Wärmespeicher-Durchmesser
 ##### not used anymore #####
+
diff --git a/techage/locale/template.txt b/techage/locale/template.txt
index a6aeb79..2d9530a 100644
--- a/techage/locale/template.txt
+++ b/techage/locale/template.txt
@@ -1,8 +1,8 @@
- ku is needed!)=
 #### TA3 Terminal ####@n@nSend commands to your machines@nand output text messages from your@nmachines to the Terminal.@n@nCommand syntax:@n  cmd <num> <cmnd>@n@nexample: cmd 181 on@n<num> is the number of the node to which the command is sent@n'on' is the command to turn machines/nodes on@nFurther commands can be retrieved by clicking on@nmachines/nodes with the Techage Info Tool.@n@nLocal commands:@n- clear    @= clear screen@n- help     @= this message@n- pub      @= switch to public use@n- priv      @= switch to private use@nTo program a user button with a command:@n  set <button-num> <button-text> <command>@ne.g. 'set 1 ON cmd 123 on'@n=
 Accu Box=
 Active:=
 All nodes:=
+Allow public chest access=
 Allow to dig/place Techage power lines nearby power poles=
 Aluminum=
 Area already loaded or max. number of Forceload Blocks reached!=
@@ -427,6 +427,7 @@ inlet/pipe error=
 inventory full=
 item output blocked=
 keep assignment=
+ku is needed=
 light=
 loaded=
 needs power=
diff --git a/techage/lua_controller/controller.lua b/techage/lua_controller/controller.lua
index c1f9b34..9673a3f 100644
--- a/techage/lua_controller/controller.lua
+++ b/techage/lua_controller/controller.lua
@@ -120,10 +120,18 @@ techage.lua_ctlr.register_function("get_ms_time", {
 	cmnd = function(self)
 		return math.floor(minetest.get_us_time() / 1000)
 	end,
-	help = "$get_ms_time()\n"..
+	help = " ms = $get_ms_time()\n"..
 		" returns time with millisecond precision."
 })
 
+techage.lua_ctlr.register_function("get_gametime", {
+	cmnd = function(self)
+		return minetest.get_gametime()
+	end,
+	help = " t = $get_gametime()\n"..
+		" returns the time, in seconds, since the world was created."
+})
+
 techage.lua_ctlr.register_function("position", {
 	cmnd = function(self, number)
 		local info = techage.get_node_info(number)
@@ -132,7 +140,7 @@ techage.lua_ctlr.register_function("position", {
 		end
 		return "(-,-,-)"
 	end,
-	help = "$position(number)\n"..
+	help = " pos = $position(number)\n"..
 		" returns the position '(x,y,z)' of the device\n with given number."
 })
 
@@ -144,7 +152,7 @@ techage.lua_ctlr.register_action("battery", {
 		local val = (BATTERY_CAPA - math.min(batmeta:get_int("content") or 0, BATTERY_CAPA))
 		return 100 - math.floor((val * 100.0 / BATTERY_CAPA))
 	end,
-	help =  " $battery()\n"..
+	help =  " lvl = $battery()\n"..
 		" Get charge level of battery connected to Controller.\n"..
 		" Function returns percent number (0-100) where 100 means full.\n"..
 		" example: battery_percent = $battery()"
diff --git a/techage/lua_controller/sensorchest.lua b/techage/lua_controller/sensorchest.lua
index aa04ddc..2a0858b 100644
--- a/techage/lua_controller/sensorchest.lua
+++ b/techage/lua_controller/sensorchest.lua
@@ -63,7 +63,7 @@ local function get_stacks(pos)
 end
 
 local function allow_metadata_inventory_put(pos, listname, index, stack, player)
-	if minetest.is_protected(pos, player:get_player_name()) then
+	if M(pos):get_string("public") ~= "true" and minetest.is_protected(pos, player:get_player_name()) then
 		return 0
 	end
 	store_action(pos, player, "put")
@@ -72,7 +72,7 @@ local function allow_metadata_inventory_put(pos, listname, index, stack, player)
 end
 
 local function allow_metadata_inventory_take(pos, listname, index, stack, player)
-	if minetest.is_protected(pos, player:get_player_name()) then
+	if M(pos):get_string("public") ~= "true" and minetest.is_protected(pos, player:get_player_name()) then
 		return 0
 	end
 	store_action(pos, player, "take")
@@ -93,12 +93,13 @@ local function after_dig_node(pos, oldnode, oldmetadata, digger)
 end
 
 local function formspec1()
-	return "size[6,4]"..
+	return "size[5.5,4]"..
 	default.gui_bg..
 	default.gui_bg_img..
 	default.gui_slots..
 	"field[0.5,1;5,1;number;TA4 Lua Controller number:;]" ..
-	"button_exit[1.5,2.5;2,1;exit;Save]"
+	"checkbox[0.5,1.8;public;"..S("Allow public chest access")..";false]"..
+	"button_exit[1.7,2.8;2,1;exit;Save]"
 end
 
 local function formspec2(pos)
@@ -147,7 +148,15 @@ minetest.register_node("techage:ta4_sensor_chest", {
 	on_receive_fields = function(pos, formname, fields, player)
 		local meta = M(pos)
 		local nvm = techage.get_nvm(pos)
-		if fields.number and fields.number ~= "" then
+		
+		if meta:get_string("public") ~= "true" and minetest.is_protected(pos, player:get_player_name()) then
+			return 0
+		end
+		
+		if fields.public then
+			meta:set_string("public", fields.public)
+		end
+		if fields.quit == "true" and fields.number and fields.number ~= "" then
 			local owner = meta:get_string("owner")
 			if techage.check_numbers(fields.number, owner) then
 				meta:set_string("number", fields.number)
diff --git a/techage/manuals/manual_ta4_DE.md b/techage/manuals/manual_ta4_DE.md
index 4807bbc..178c703 100644
--- a/techage/manuals/manual_ta4_DE.md
+++ b/techage/manuals/manual_ta4_DE.md
@@ -386,7 +386,17 @@ Der Server dient zur zentralen Speicherung von Daten von mehreren Lua Controller
 
 ### TA4 Sensor Kiste/Chest
 
-Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten. Sie hat erweitere Kommandos zur Fernsteuerung.
+Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten in Verbindung mit dem Lua Controller.
+Wird etwas in die Kiste gelegt, oder entnommen, oder eine der Tasten "F1"/"F2" gedrückt, so wird ein Event-Signal an den Lua Controller gesendet.
+Die Sensor Kiste unterstützt folgende Kommandos:
+
+- Über `state = $read_data(<num>, "state")` kann der Status der Kiste abgefragt werden. Mögliche Antworten sind: "empty", "loaded", "full"
+- Über `name, action = $read_data(<num>, "action")` kann die letzte Spieleraktion abgefragt werden. `name` ist der Spielername, Als `action` wird zurückgeliefert: "put", "take", "f1", "f2".
+- Über `stacks = $read_data(<num>, "stacks")` kann der Inhalt der Kiste ausgelesen werden. Siehe dazu: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest
+- Über `$send_cmnd(<num>, "text", "press both buttons and\nput something into the chest")` kann der Text im Menü der Sensor Kiste gesetzt werden.
+
+Über die Checkbox "Erlaube öffentlichen Zugriff" kann eingestellt werden, ob die Kiste von jedem genutzt werden darf, oder nur von Spielern die hier Zugriffsrechte haben.
+
 
 [ta4_sensor_chest|image]
 
@@ -602,4 +612,4 @@ Beim Weitergeben wird in der Zielmaschine pro Item nur eine Position im Inventar
 
 Die Verarbeitungsleistung beträgt bis zu 8 Items alle 3 Sekunden.
 
-[ta4_injector|image]
\ No newline at end of file
+[ta4_injector|image]
diff --git a/techage/manuals/manual_ta4_EN.md b/techage/manuals/manual_ta4_EN.md
index 04acecd..665ca46 100644
--- a/techage/manuals/manual_ta4_EN.md
+++ b/techage/manuals/manual_ta4_EN.md
@@ -388,7 +388,16 @@ The server is used for the central storage of data from several Lua controllers.
 
 ### TA4 Sensor Box / Chest
 
-The TA4 sensor box is used to set up automatic warehouses or vending machines. It has additional commands for remote control.
+The TA4 sensor box is used to set up automatic warehouses or vending machines in conjunction with the Lua controller.
+If something is put into the box or removed, or one of the "F1" / "F2" keys is pressed, an event signal is sent to the Lua controller.
+The sensor box supports the following commands:
+
+- The status of the box can be queried via `state = $read_data(<num>, "state")`. Possible answers are: "empty", "loaded", "full"
+- The last player action can be queried via `name, action = $read_data(<num>, "action")`. `name` is the player name. One of the following is returned as `action`: "put", "take", "f1", "f2".
+- The contents of the box can be read out via `stacks = $read_data(<num>, "stacks")`. See: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest
+- Via `$send_cmnd(<num>, "text", "press both buttons and\nput something into the chest")` the text can be set in the menu of the sensor box.
+
+The checkbox "Allow public chest access" can be used to set whether the box can be used by everyone or only by players who have access/protection rights here.
 
 [ta4_sensor_chest|image]
 
@@ -513,9 +522,9 @@ The processing power is 12 items every 2 s, if TA4 tubes are used on both sides.
 The TA4 pusher has two additional commands for the Lua controller:
 
 - `config` is used to configure the pusher, analogous to manual configuration via the menu.
-  Example: `$ send_cmnd(1234, "config", "default: dirt")`
+  Example: `$send_cmnd(1234, "config", "default: dirt")`
 - `pull` is used to send an order to the pusher:
-  Example: `$ send_cmnd(1234, "pull", "default: dirt 8")`
+  Example: `$send_cmnd(1234, "pull", "default: dirt 8")`
   Values ​​from 1 to 12 are permitted as numbers. Then the pusher goes back to `stopped` mode and sends an" off "command back to the transmitter of the" pull "command.
 
 [ta4_pusher|image]
@@ -552,8 +561,8 @@ The chest can only be used by players who can build at this location, i.e. who h
 The chest has an additional command for the Lua controller:
 
 - `count` is used to request how many items are in the chest.
-  Example 1: `$ read_data(CHEST, "count")` -> Sum of items across all 8 stores
-  Example 2: `$ read_data(CHEST, "count", 2)` -> number of items in store 2 (second from left)
+  Example 1: `$read_data(CHEST, "count")` -> Sum of items across all 8 stores
+  Example 2: `$read_data(CHEST, "count", 2)` -> number of items in store 2 (second from left)
 
 [ta4_8x2000_chest|image]
 
diff --git a/techage/manuals/ta4_lua_controller_EN.md b/techage/manuals/ta4_lua_controller_EN.md
index 297989c..0d21868 100644
--- a/techage/manuals/ta4_lua_controller_EN.md
+++ b/techage/manuals/ta4_lua_controller_EN.md
@@ -330,7 +330,8 @@ In addition to Lua standard function the Lua Controller provides the following f
   E.g.: `$print("Hello "..name)`
 - `$loopcycle(seconds)` - This function allows to change the call frequency of the controller loop() function, witch is per default one second. For more info, see "Cyclic Task"
 - `$events(bool)` - Enable/disable event handling. For more info, see "Events"
-- `$get_ms_time()` - Returns time with millisecond precision
+- `$get_ms_time()` - Returns the time with millisecond precision
+- `get_gametime()` - Returns the time, in seconds, since the world was created
 - `$time_as_str()` - Read the time of day (ingame) as text string in 24h format, like "18:45"
 - `$time_as_num()` - Read the time of day (ingame) as integer number in 24h format, like 1845
 - `$get_input(num)` - Read an input value provided by an external block with the given number _num_. The block has to be configured with the number of the controller to be able to send status messages (on/off commands) to the controller.  _num_ is the number of the remote block, like "1234".
diff --git a/techage/manuals/ta4_lua_controller_EN.pdf b/techage/manuals/ta4_lua_controller_EN.pdf
index 1273eb1..eeb974f 100644
Binary files a/techage/manuals/ta4_lua_controller_EN.pdf and b/techage/manuals/ta4_lua_controller_EN.pdf differ
diff --git a/techage/power/power_terminal2.lua b/techage/power/power_terminal2.lua
index 6bb61cc..70ab331 100644
--- a/techage/power/power_terminal2.lua
+++ b/techage/power/power_terminal2.lua
@@ -193,7 +193,7 @@ local function get_state(netw)
 	if #(netw.gen1 or {}) + #(netw.gen2 or {}) == 0 then
 		state = S("No power grid or running generator!")
 	elseif needed > (netw.available1 or 0) then
-		state = S("Probably too many consumers (")..needed..S(" ku is needed!)")
+		state = S("Probably too many consumers (")..needed.." "..S("ku is needed").."!)"
 	elseif (netw.num_nodes or 0) < techage.networks.MAX_NUM_NODES then
 		state = S("Number of power grid blocks")..": "..(netw.num_nodes or 0)..",  "..S("Max. needed power")..": "..needed.. " ku"
 	else
diff --git a/techage/ta3_power/akkubox.lua b/techage/ta3_power/akkubox.lua
index 84dfcae..53a60e6 100644
--- a/techage/ta3_power/akkubox.lua
+++ b/techage/ta3_power/akkubox.lua
@@ -120,19 +120,15 @@ local function get_capa(itemstack)
 	return 0
 end
 
-local function set_capa(pos, oldnode, digger, capa)
-	local node = ItemStack(oldnode.name)
-	local meta = node:get_meta()
+local function set_capa(pos, oldnode, oldmetadata, drops)
+	local nvm = techage.get_nvm(pos)
+	local capa = nvm.capa
+	local meta = drops[1]:get_meta()
 	capa = techage.power.percent(PWR_CAPA, capa)
 	capa = (math.floor((capa or 0) / 5)) * 5
 	meta:set_int("capa", capa)
 	local text = S("TA3 Accu Box").." ("..capa.." %)"
 	meta:set_string("description", text)
-	local inv = minetest.get_inventory({type="player", name=digger:get_player_name()})
-	local left_over = inv:add_item("main", node)
-	if left_over:get_count() > 0 then
-		minetest.add_item(pos, node)
-	end
 end
 
 local function after_place_node(pos, placer, itemstack)
@@ -149,9 +145,7 @@ local function after_place_node(pos, placer, itemstack)
 end
 
 local function after_dig_node(pos, oldnode, oldmetadata, digger)
-	local nvm = techage.get_nvm(pos)
 	Cable:after_dig_node(pos)
-	set_capa(pos, oldnode, digger, nvm.capa)
 	techage.del_mem(pos)
 end
 
@@ -188,13 +182,12 @@ minetest.register_node("techage:ta3_akku", {
 	after_dig_node = after_dig_node,
 	tubelib2_on_update2 = tubelib2_on_update2,
 	networks = net_def,
-
-	drop = "", -- don't remove, item will be added via 'set_capa'
 	paramtype2 = "facedir",
 	groups = {cracky=2, crumbly=2, choppy=2},
 	on_rotate = screwdriver.disallow,
 	is_ground_content = false,
 	sounds = default.node_sound_wood_defaults(),
+	preserve_metadata = set_capa,
 })
 
 Cable:add_secondary_node_names({"techage:ta3_akku"})
diff --git a/towercrane/control.lua b/towercrane/control.lua
index e4b594c..1eebc25 100644
--- a/towercrane/control.lua
+++ b/towercrane/control.lua
@@ -281,8 +281,8 @@ minetest.register_node("towercrane:mast_ctrl_off", {
 	-- switch the crane ON
 	on_rightclick = function (pos, node, clicker)
 		if is_my_crane(pos, clicker) and not is_operator(clicker) then
-			start_crane(pos, clicker)
 			if set_operator_privs(clicker, pos) then
+				start_crane(pos, clicker)
 				local pos1, pos2 = calc_construction_area(pos)
 				-- control player every second
 				minetest.after(1, control_player, pos, pos1, pos2, clicker:get_player_name())