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US Patent: 543,494
Pipe Wrench
Patentee:
Norman D. Macdonald (exact or similar names) - Boston, MA

USPTO Classifications:
81/108

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. Murphy
Matthew M. Blunt
Jas. H. Churchill
Patent Dates:
Applied: Dec. 11, 1894
Granted: Jul. 30, 1895

Patent Pictures:
Norman D. Macdonald patent July 30, 1895
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Description:
Screw-adjustable hook-jaw pipe wrench, with a spring to hold the hook jaw in engagement with the work piece.

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