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US Patent: 876,925
Chain Pipe Wrench
George Amborn - New York, NY

USPTO Classifications:

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

J. H. Williams & Co. - Brooklyn, NY

J. H. Williams & Co. - Brooklyn, NY

Eugene V. Myers
Theodore T. Snell
Fred White
René Bruine

Patent Dates:
Applied: Mar. 08, 1907
Granted: Jan. 21, 1908

Patent Pictures:
George Amborn patent January 21, 1908
USPTO pdf tiff
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Amborn received three interrelated patents on January 21, 1908 -- this patent, 876,926, and 876,927. The patent date appears on some models of Williams' VULCAN chain wrenches. The focus of this patent is the attachment point for the free end of the chain. The hook point on the inner faces of the jaws is deep enough to retain the chain.

Arthur C. Fraser & Co. - patent attorneys

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