Heating apparatus
United States Patent 2738409
US Patent References:
Oil well heater
- - 1915895

Well heater
- - 2500513

Electric oil well heater
- - 2548360

Well heater
- - 2666487


Inventors:
Bowman, Hyman D.
Publication Date:
03/13/1956
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Assignee:
Bowman, Hyman D.
Primary Class:
392/305
Other Classes:
392/471, 392/489, 166/60
International Classes:
E21B36/04; E21B36/00