| 摘要 |
the push-button slides 3 of a push-button unit 1 are coupled to one another by means of a filament 5 such that they can never all be switched off during any desired operation and such that one, and only one, is always switched on. The filament 5 is braced in a zigzag or meandering shape with a predetermined length via fixed-position housing guides 2 and through the push-button slides, forming a predetermined number of lifting loops 9. <IMAGE>
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