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Tag: Heater Plates

Griswold Method of Forming Electric Heater Plates Patent, 1930

Griswold Method of Forming Electric Heater Plates Patent, 1930

Inventor: L. McKinney. Assigned to Griswold Mfg. Co. Applied for May 9, 1928. Patent granted Oct. 21, 1930. #1,778,808.


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