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US Patent: 623,800
Wrench
Patentee:
James L. Martin (exact or similar names) - Marion Center, PA

USPTO Classifications:
81/118

Tool Categories:
wrenches : socket wrenches

Assignees:
James L. Martin - Marion Center, PA
Edgar C. Wynkoop - Marion Center, PA

Manufacturer:
Unknown

Witnesses:
Edward Thorpe
Isaac B. Owens
James McGregor
Hiram Stuchell

Patent Dates:
Applied: Dec. 03, 1898
Granted: Apr. 25, 1899

Patent Pictures: [ 1 | 2 ]
James L. Martin patent April 25, 1899
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Description:
The jaws tend to spring apart and the screw and thumb nut close them. The rigidity of the spring prongs that form the jaws mean they resist any tendency to spring or twist sideways.

A known example is approx. 7 1/2 inches long overall, and is marked with the patent date.

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