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Patents for Porter Mfg. Co.
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
291,934	Jan. 15, 1884	D.R. Porter	Wrench	pipe wrenches
CA-20,932	Jan. 22, 1885	D.R. Porter	Wrench	pipe wrenches
389,899	Sep. 25, 1888	D.R. Porter	Pipe Wrench	quick adjust wrenches

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