Embodiments of the present invention are directed to a frame component of a pallet assembly. The floor comprises a plurality of safety glass panes laid adjacent each other and which are freely vertically movable relative to one another and whose surface forming the playing surface is provided with a plurality of rough areas. The melt drive tank includes a hermetically-sealed drive chamber including an opening allowing the drive chamber to communicate with the melt storage room, and the melt drive tank stores melt, which flows from the opening, in the drive chamber. The system may include a timer to measure a predetermined time interval for the process to perform a desired action, a counter to count a number of times the process fails to perform the desired action before the timer expires, and a controller to kill the process when the counter exceeds a maximum number of failures. The trace condition embedding unit further includes intermittent switch information which indicates a ratio of trace collection to reception times of the request telegraphic message. A battery is positioned and charged by energizing the charger, putting the battery at a battery zone, adjusting the charger buttons, pressing down the pushing button to further press the battery tightly and then releasing the pushing button.