key switch

   a switch operated by a keyed lock mechanism, which may be an integral part of the switch assembly

Locksmith dictionary . 2014.

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  • key — I. noun Etymology: Middle English, from Old English cǣg; akin to Old Frisian kēi key Date: before 12th century 1. a. a usually metal instrument by which the bolt of a lock is turned b. any of various devices having the form or function of such a… …   New Collegiate Dictionary

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