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Casement bolts with a rack-and-pinion mechanism controlled by a rotary handle: two sliding rods, fixed to one leaf of e.g. a French window, are moved up and down in opposite directions into sockets in a frame in order to lock it. A variant is called the espagnolette, where the bolt-rods have hooks on the ends that engage in slots at the top and bottom of the main frame, locking and tightening the opening-light.

Subjects: Architecture.

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