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US Patent: 404,789
Pipe Wrench
Patentee:
Charles L. Dunham (exact or similar names) - Union City, PA

USPTO Classifications:
81/65.4

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

Assignees:
William F. Rupp - Chicago, IL

Manufacturer:
Not known to have been produced

Witnesses:
Joseph A. Ryan
Edwin L. Yewell
M. W. Shreve
E. N. Foster
Patent Dates:
Applied: Jan. 12, 1888
Granted: Jun. 04, 1889

Patent Pictures:
Charles L. Dunham patent June 4, 1889
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Description:
A variant of chain wrench with a rack teeth on the lever handle engaging rack teeth on the leading piece of the gripping links.

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