| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board of a game machine which can be reused even in the case that erasable identification information is described. SOLUTION: At the lower left corner of a power switch board 36 on which an element 51 is mounted, identification information S2 for identifying the power switch board 36 is engraved by irradiation with a laser beam. COPYRIGHT: (C)2006,JPO&NCIPI
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