Electric heating furnace
United States Patent 1975410

Inventors:
Simpson, George L.
Publication Date:
10/02/1934
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Assignee:
PITTSBURGH RES CORP
Primary Class:
373/134
Other Classes:
392/375, 338/284, 392/351, 392/360, 338/282, 266/256, 338/294, 338/217
International Classes:
F27D11/02; H05B3/64; F27D11/00; H05B3/62