| 摘要 |
A pushbutton switch having a rectangular opening in a forward end of its housing substantially filled by a single rectangular pushbutton has a rectangular resilient seal attached to the housing at the forward end, the seal further having cylindrical shape disposed within the rectangular shape attached to a cylindrical surface at the rear of the pushbutton, the rectangular and cylindrical shapes being joined together by a reflex bend to provide a rolling movement of the seal upon depresion of the pushbutton.
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