Well heater
United States Patent 2792895
US Patent References:
/1457690.html
- - 1457690

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Oil well heater
- - 2632836

Apparatus for heating oil wells
- - 2647196


Inventors:
Carpenter, Clayton A.
Publication Date:
05/21/1957
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Assignee:
UNION OIL CO
Primary Class:
166/61
Other Classes:
392/301, 392/480
International Classes:
E21B36/04; E21B36/00