| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine which has an enhanced holding force of game nails. SOLUTION: In this game machine which has a game board 1 constituted by driving a game nail 500 to a driving hole 1c bored in a synthetic resin game board body 1b, the game nail has a screw portion 502 which is constituted of an outer diameter larger than the nails body 501 and has a spiral gutter at its top. The screw portion has a circular gutter 520 along the circumference direction of the game nail. COPYRIGHT: (C)2008,JPO&INPIT
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