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US Patent: 876,469
Strap Pipe-Wrench
William C. Martin - Mansfield, MA
Louis H. Ogden - South Boston, MA

USPTO Classifications:

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

Martin and Ogden Wrench Company - n.p., MA

George H. Wilkins Co. - Chicago, IL
Martin and Ogden Wrench Company - South Boston, MA

Lowell M. Maxham
Helen Macomber
A. B. Upham
Warren N. Akers

Patent Dates:
Applied: Oct. 07, 1907
Granted: Jan. 14, 1908

Patent Pictures: [ 1 | 2 ]
William C. Martin and Louis H. Ogden patent January 14, 1908
USPTO pdf tiff
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The "jaw" portion is a rocking cam to which the strap attaches. This structure is intended to make it easier to wrap the strap around the object to be turned. The specifications also note the strap is easily replaced.

Advertised as the M & O WRENCH by Martin and Ogden of South Boston, MA in 1910; advertised as the PEERLESS STRAP WRENCH in 1922, with a Chicago manufacturer.

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