| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine capable of effectively preventing illegal door opening actions. SOLUTION: When detecting that a front door 8 is unlocked without using an exclusive key 90 in the game machine 1, the sound of a specified frequency band is output from speakers 21L and 21R, another game machine 1 installed in a hall receives the sound of the specified frequency band by microphones 97L and 97R, and it is reported to an external security company or a manager or the like that the front door 8 is fraudulently unlocked. COPYRIGHT: (C)2009,JPO&INPIT
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