| 摘要 |
PROBLEM TO BE SOLVED: To provide a management device for calculating and outputting the ratio of the number of times that a normal variable display device performs variable display to the number of times of the advance of a hit ball to a normal start area for nail adjustment in winning rate setting. SOLUTION: This management device is provided with a function for summing up the number of times of the advance of the hit ball to the normal start area and the number of times that the normal variable display device performs the variable display and calculating and outputting the ratio of the number of times that the normal variable display device performs the variable display to the number of times of the advance of the hit ball to the normal start area.
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