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US Patent: 670,681
Adjustable Pipe and Nut Wrench
Henry J. Martin - Chicago, IL

USPTO Classifications:

Tool Categories:
wrenches : alligator wrenches

Whitman and Barnes Manufacturing Company - Akron, OH

Whitman and Barnes Manufacturing Company - Akron, OH

Chas. E. Gaylord
John Enders, Jr.
J. B. Wilson
L. R. Browne

Patent Dates:
Applied: Nov. 10, 1900
Granted: Mar. 26, 1901

Patent Pictures: [ 1 | 2 ]
Henry J. Martin patent March 26, 1901
USPTO pdf tiff
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The center adjusting bolt opens and closes the movable jaws which are hinged by pivot screws at their outer edges. Marketed as the BULL TERRIER by Whitman and Barnes.

Few examples of the W&B BULL TERRIER are known; it probably was not a commercial success compared to the ELGIN (pat. nos. 584,019 & 809,755), or the Charles S. Bonney patent (no. 728,842) distributed as the Diamond Edge and KEEN KUTTER adjustable alligator wrench.

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