Title:
Well heater
United States Patent 2500513

Inventors:
Bowman, Hyman D.
Publication Date:
03/14/1950
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Assignee:
Bowman, Hyman D.
Primary Class:
Other Classes:
166/214, 392/301, 166/243, 219/523, 166/60
International Classes:
E21B36/04; E21B36/00