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US Patent: 171,550
Screw Wrench
Patentee:
John H. Coes - Worcester, MA

USPTO Classifications:
81/171

Tool Categories:
wrenches : nut wrenches
wrenches : wrench components : wrench handle components

Assignees:
None

Manufacturer:
A. G. Coes & Co. - Worcester, MA

Witnesses:
Charles H. Burleigh
A. E. Pierce

Patent Dates:
Applied: Jun. 19, 1871
Granted: Dec. 28, 1875

Patent Pictures:
John H. Coes Pat. Dec. 28, 1875
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Description:
The patent is for the relative arrangement of the reinforced wrench-bar, sliding jaw, and operating screw. It includes the "jog bar" on the back of the wrench bar. The specifications mention a back reinforcing rib like the Dec. 12, 1865 Lindsay patent (no. 514,65). The patent specifically cites the Richard patent no 27,090.

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