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US Patent: 94,085
Improvement in Duplex Wrench
Augustus Ball Davis - Philadelphia, PA

USPTO Classifications:

Tool Categories:
wrenches : pipe and nut combination wrenches

William C. Ewing - Philadelphia, PA
A. B. Davis - Philadelphia, PA

Philadelphia Tool Co. - Philadelphia, PA

Wm. A. Steel
John Parker
John White
Harry Smith

Patent Dates:
Granted: Aug. 24, 1869

Patent Pictures: [ 1 | 2 ]
Augustus Ball Davis patent August 24, 1869
USPTO pdf tiff
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The patent is primarily for the movable jaw with both flat and pipe-gripping surfaces, the internal spring, and the opening surrounding the adjusting nut. According to Ken Cope's "American Wrench Makers 1830-1930," this patent along with Davis's August 9, 1870 (no. 106,129) and Nov. 24, 1871 (no. 120,947) patents was the basis for the DUPLEX wrench produced by the Philadelphia Tool Co.

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