| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently secure performance areas and playing areas. SOLUTION: A game performance unit installing recessed part 30 is formed in the shape of a recess with the first peripheral wall 290, the second peripheral wall 291, the third peripheral wall 292 and the fourth peripheral wall 293 surrounding the right and left sides and the rear part of the upper side of the boy frame 3. The first peripheral wall 290 is peripherally built cylindrical backward from its internal surface on the spindle side, a flange face part of its upper side part, the flange face part on its opening side and the internal surface of its lower side part. The second peripheral wall 291 is extended backward from the first peripheral wall 290, the third peripheral wall 292 backward from the second peripheral wall 291 and the fourth peripheral wall 293 backward from the third peripheral wall 292. COPYRIGHT: (C)2009,JPO&INPIT
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