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US Patent: 76,519
Improvement inWrenches
Patentee:
A. S. Petrie (exact or similar names) - Hudson City, NJ

USPTO Classifications:
81/128, 81/146, 81/180.1

Tool Categories:
wrenches : nut wrenches
wrenches : wrench adjustment types

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. W. Coombs
A. Le Clerc

Patent Dates:
Granted: Apr. 07, 1868

Patent Pictures:
A. S. Petrie Pat. April 7, 1868
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Description:
The movable jaw includes a sliding key with oblique ribs that meshes with transverse oblique grooves or ribs on the wrench shank. A pin or screw in the key limits its range of motion and holds in in the jaw.

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