| 摘要 |
PROBLEM TO BE SOLVED: To enable a player to depress switches reliably and easily by visual observation. SOLUTION: Marks 501 for depressing switches by visual observation are respectively provided for drums 30a-30c in such a way that the marks 501 are protruded from the peripheral edges of the drums 30a-30c in the directions of their widths. As only the marks 501 for depressing switches by visual observation are protruded from the peripheral edges of the drums, it is easily possible to grasp that the marks 501 for depressing switches by visual observation come forward during rotation even if the marks 501 are small and even for a novice to depress switches by visual observation more reliably and easily.
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