Century Dictionary and Cyclopedia
- n. In lock-making, a safety-key which, when placed in its lock, may serve to prevent the use of a master-key or any other key from the opposite side of the door.
“We learn from Dr. Bédart that as early as 1804 an arrangement suggestive of the stop-key was in use in Avignon Cathedral.”
“Horatio Clarke, of Reading, Mass., applied for a patent covering a form of stop-key in 1877.”
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