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US Patent: 447,665
Frank S. Cook - Chicago, IL

USPTO Classifications:
81/173, 81/177.1, 81/178, 81/186, 81/92

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : wrench components : wrench jaw components

Capitol Manufacturing Company - Chicago, IL

Capitol Manufacturing Company - Chicago, IL

J. A. Rutherford
Jas. E. Hutchinson
C. H. Gurney
Louis Schlesinger

Patent Dates:
Applied: Dec. 29, 1890
Granted: Mar. 03, 1891

Patent Pictures: [ 1 | 2 ]
Frank S. Cook patent March 3, 1891
USPTO pdf tiff
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The patent is for the "duplex pipe-gripping pawl" including the springs. The wrench body to which the patent applies is covered by pat. no. 273,170.

Marketed as the HERCULES combination nut and pipe wrench.

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