Screw Punch

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“Screw-punch. a, bed; b, yoke, on the inner sides of which are slides for the cross-head c; d, the punch proper; e, nut for the screw; f, weighted lever by which the screw is made to exert its power upon the punch d.” -Whitney, 1911


William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)


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