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US Patent: 120,947
Improvement in Duplex Wrenches
Augustus Ball Davis - Philadelphia, PA

USPTO Classifications:
81/178, 81/93

Tool Categories:
wrenches : wrench components : wrench jaw components
wrenches : pipe and nut combination wrenches


Philadelphia Tool Co. - Philadelphia, PA

John Parker
Wm. A. Steel
Frank B. Richards

Patent Dates:
Granted: Nov. 14, 1871

Patent Pictures:
A. B. Davis Pat. Nov. 14, 1871
USPTO pdf tiff
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The improvement in this patent is a reversible hardened toothed plate for either the flat or beveled jaw on the pipe wrench side of the wrench. It is an improvement on Davis' previous patents (nos. 94,085 and 106,129).

Known examples of Davis' Duplex Wrench do not include this separate piece with teeth.

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