Electrical heating unit
United States Patent 2472930
US Patent References:
/1023485.html
- - 1023485

/1180614.html
- - 1180614

/1226471.html
- - 1226471

Variable resistance
- - 1539266

Metal film resistor
- - 2281843


Inventors:
Wilkes, Donald P.
Publication Date:
06/14/1949
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Assignee:
WESTERN ELECTRIC CO
Primary Class:
428/591
Other Classes:
138/109, 338/333, 428/661, 338/332, 138/140, 266/208
International Classes:
H05B3/42; H05B3/66; H05B3/62
US Patent References:
2298254Electric immersion heater for liquid electrolytes