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Screw-punch.

A punching device operated by a screw. In that shown, two screws C D are used for forcing the punch, one screwing into the first with a finer thread, so that when the larger or outer screw is turned, the inner one, being held from turning by a square shank passing through a square hole in the stock, screws into it, and therefore exerts a slow and powerful downward movement. See also punching-bear.

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