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US Patent: 2,656,751
Replaceable Jaw Insert for Pipe Wrenches
Walter J. Johnson - Buffalo, NY
Carl G. Ertell - Eggertsville, NY

USPTO Classifications:
81/101, 81/186

Tool Categories:
wrenches : wrench components : wrench jaw components

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

Not known to have been produced

none listed

Patent Dates:
Applied: Jul. 14, 1950
Granted: Oct. 27, 1953

Patent Pictures:
Walter J. Johnson and Carl G. Ertell patent October 27, 1953
USPTO pdf tiff
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The focus of the patent is hard inserts for lightweight wrenches made of aluminum alloy or similar light, soft metal. The specifications contain a longish discussion of metallurgy.

Fraser, Myers & Manley - patent attorneys

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