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US Patent: 426,956
Wrench
Improved Pipe Wrench
Patentee:
Daniel R. Porter (exact or similar names) - Chelsea, MA

USPTO Classifications:
81/100, 81/166

Tool Categories:
wrenches : pipe wrenches

Assignees:
William F. Goldthwaite - Chelsea, MA
Charles F. Brown - Boston, MA
Arthur W. Crossley - Boston, MA

Manufacturer:
Not known to have been produced

Witnesses:
A. D. Harrison
Irving H. Fay
Arthur W. Crossley

Patent Dates:
Applied: Dec. 21, 1889
Granted: Apr. 29, 1890

Patent Pictures:
Daniel R. Porter patent April 29, 1890
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Description:
The focus of the patent is the guide for the shank of the movable jaw, and the ears on the "shoe."

Corresponding Canadian patent CA-35,548 was granted Dec. 2, 1890.

Improved by Daniel R. Porter's April 21, 1891 patent no. 450,681.

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