Heating unit
United States Patent 2820133
US Patent References:
Water heater
- - 2510456

Electric heating device
- - 2725457


Inventors:
Norton, William H.
Publication Date:
01/14/1958
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Assignee:
THERMEL INC
Primary Class:
219/525
Other Classes:
219/526, 219/537, 219/535
International Classes:
H05B3/00
Foreign References:
DE351595C