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US Patent: 215,128
Wrench
Improved Pipe-Wrench
Patentees:
John George Johnson (exact or similar names) - Girardville, PA
Oliver Golightly Johnson (exact or similar names) - Girardville, PA

USPTO Classifications:
81/126

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Sedgwick
Achilles Schehl
Joseph Cowell
B. J. Smith

Patent Dates:
Applied: Nov. 25, 1878
Granted: May 06, 1879

Patent Pictures:
J. G. Johnson and O. G. Johnson patent May 6, 1879
USPTO (New site tip)
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Description:
The linkage brings together two curved-face jaws. The patent is for the loop on the lower jaw that encloses the outer jaw, and the slot in the lower jaw.

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