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A simple device for preventing the accidental useage of a device. (e.g. plastic covers over fire alarm switches so that they can't be set off [accidentally].) The Jargon File defines a molly-guard as: " A shield to prevent tripping of some Big Red Switch by clumsy or ignorant hands. Originally used of the plexiglass covers improvised for the BRS on an IBM 4341 after a programmer's toddler daughter (named Molly) frobbed it twice in one day. Later generalized to covers over stop/reset switches on disk drives and networking equipment. In hardware catalogues, you'll see the much less [interesting] [description] “guarded button”."
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