Abstract: A mixer 20 of the invention has a plurality of LAN ports that are connected with a plurality of players 10 and input/output a control signal from/to the players 10, an input detection device 210 that detects that the control signal is input from connected one of the players 10, an ID determination device 220 that determines an ID pre-assigned to the detected one LAN port as an ID of the player 10 connected to the one LAN port, and an ID transmission device 230 that transmits the determined ID to the player 10 through the one LAN port.

Abstract: A sealing structure of a liquid crystal injection holes in a liquid crystal display device, capable of injecting the liquid crystal from a plurality of liquid crystal injection holes into the inside of a liquid crystal cell enclosed by a sealant. The sealing structure of the liquid crystal injection holes is constructed so that each liquid crystal injection holes is linked by a drain of a sealant one to another, and the sealant has an opening portion which connects the inside of the cell with the outside, thus, making it possible to seal all the injection holes by filling the aforementioned drain with the sealing agent which is injected from one of the injection holes.