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The Antique Wrench Patent Archive

Every grip the nineteenth century took on a nut

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Hammer-head wrench

Patent drawing of a monkey wrench showing the handle, notched shank, sliding jaw with internal pawl and spring mechanism, and a hammer-shaped rigid head, with multiple cutaway and detail views labeled with reference letters A through L.

MONKEY-WRENCH.Henry Bivin · February 27, 1894

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