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Patents for Helwig Mfg. Co.
Patents 1 - 3 of 3
First set of recordsLast set of records
188,133Mar. 06, 1877J. HellwigBolt and Rivet Cutterbolt cutters
444,635Jan. 13, 1891J. HelwigBolt and Rivet Cutterbolt cutters
1,502,192Jul. 22, 1924J. HelwigWrench and Process of Manufacturing the Samescrew adjust wrenches
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