| 摘要 |
A driving body is placed on four sets of push switches which are arranged on a concentric circle at equal intervals of 90 degrees. The driving body is pivotally supported by a holder to be rockable, and a driving rod protruding from the driving body is inserted through a square opening formed in the slider, and respective sides of the opening are set parallel to straight lines connecting two sets of adjacent push switches with each other.
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