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US Patent: 336,468
Pipe Wrench
Patentees:
Christian Bonnichsen - Newburgh, NY
Michael R. Chrystal - Newburgh, NY

USPTO Classifications:
81/65.2

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
P. B. Turpin
W. W. Hollingsworth
Laurence C. Bodine
Jacob Van Wagenen

Patent Dates:
Applied: Oct. 29, 1885
Granted: Feb. 16, 1886

Patent Pictures:
Christian Bonnichsen and Michael R. Chrystal patent February 16, 1886
USPTO pdf tiff
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Description:
The gripping portion is alternately a chain or semi-circular jaws. Either form is connected to the handle by a swinging link.

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