Title:
Heating apparatus
United States Patent 2738409
Inventors:
Bowman, Hyman D.
Publication Date:
03/13/1956
Export Citation:
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Assignee:
Bowman, Hyman D.
Primary Class:
392/305
Other Classes:
166/60, 392/471, 392/489
International Classes:
E21B36/04; E21B36/00
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US Patent References:
2666487Well heater
2548360Electric oil well heater
2500513Well heater
1915895Oil well heater