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US Patent: 642,797
Pipe Wrench
Patentee:
John O. Lawson (exact or similar names) - Brockton, MA

USPTO Classifications:
220/86.1, 81/65.4

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Henry F. Parker
Carl G. Smith
M. S. Morse
A. M. Tuttle
Patent Dates:
Applied: Apr. 21, 1899
Granted: Feb. 06, 1900

Patent Pictures:
John O. Lawson patent February 6, 1900
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Description:
Combination tongs and chain pipe wrench; the adjusting end of the chain attaches to a toothed block on the "upper" side.

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