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US Patent: 172,180
Improvement in Plow-Clevis
Patentee:
John Schofield - Moline, IL

USPTO Classifications:
278/96.2

Tool Categories:
agricultural tools : clevises
wrenches : auxiliary wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. H. Grover
W. H. Richards
Robert Everett
Walter C. Masi

Patent Dates:
Applied: Nov. 06, 1875
Granted: Jan. 11, 1876

Patent Pictures:
John Schofield Pat. January 11, 1876
USPTO pdf tiff
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Description:
The wrench-headed pin in this patent is specifically mentioned in the text.

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