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US Patent: 322,256
Wrench
Patentee:
Thomas J. Campbell - Westfield, MA

USPTO Classifications:
81/92, 81/DIG.6

Tool Categories:
wrenches : pipe wrenches

Assignees:
Moses P. Breckinridge - Westfield, MA
Thomas J. Campbell - Westfield, MA

Manufacturer:
Eaton, Cole, and Burnham Co. - Bridgeport, CT

Witnesses:
Wm. H, Chapin
J. D. Garfield
Geo. Tho. Warwick

Patent Dates:
Applied: Apr. 20, 1885
Granted: Jul. 14, 1885

Patent Pictures:
Thomas J. Campbell patent July 14, 1885
USPTO pdf tiff
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Description:
Quick adjusting jaw with pipe gripping teeth; the inner surface is curved with teeth to engage rack teeth on the main shank.

The owner of a known example says it was made by Eaton, Cole and Burnham.

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