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US Patent: 138,468
Wrenches
Patentees:
Stephen Barry (exact or similar names) - Brunswick, OH
Frank Perkins (exact or similar names) - Brunswick, OH

USPTO Classifications:
81/126

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Unknown

Witnesses:
D. L. Wood
Geo. W. Tibbitts
Frank Tibbitts
M. E. Wilson
Patent Dates:
Applied: Jan. 17, 1873
Granted: May 06, 1873

Patent Pictures: [ 1 | 2 ]
Barry and Perkins Pat. May 6, 1873
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Description:
The self-adjusting wrench features two nut sizes. A known example differs in small details from the patent drawing.

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