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US Patent: 876,927
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
E. O. Mitchell
Fred White

Patent Dates:
Applied: May 06, 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 Jan. 21, 1908 -- 876,925, 876,926, and this patent. This patent shares reversible jaw plates with pat. no. 876,926. The reversible jaw pieces were the main feature of Williams' VULCAN BIJAW chain wrenches which were introduced in spring, 1910. The inner face of the jaw plates has a different form of hooks.

Later modifications and improvements received patent nos. 1,146,119 and 1,146,120.

Arthur C. Fraser & Co. - patent attorneys

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