| 摘要 |
PROBLEM TO BE SOLVED: To make a plurality of covers easy to fit and difficult to remove and to prevent the covers from being removed easily for a fraudulent purpose by fitting the covers at specific relations when the covers are fitted to the back face of a game machine. SOLUTION: A slide coupling plate E1 is fitted on covers C1-C3 covering control boards V1-V3 arranged on the back face of a mechanism plate 21, and coupling holding pieces S1, S2 are arranged at the peripheral sections of the control boards V1-V3. The slide coupling plate E1 is slidingly inserted into the coupling holding pieces S1, S2 to fit a plurality of covers C1-C3. The covers C1-C3 are fitted to the back face of a game board in the specific sequence so that the cover, fitted immediately after, functions as an interference member to disable the removal of the cover, fitted immediately before.
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