Clasp lock

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a lock which closes or secures itself by means of a spring.

See also: Clasp

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
engineer Gideon Sundback was working for a Canadian firm making clasp locks when he came up with the idea for the zipper in 1914.
You might know that Whitcomb Judson sold the first "clasp locks" at the 1893 Chicago World's Fair, but when the U.S.