Title:
Oil well heater
United States Patent 2893490
US Patent References:
/1169262.html
- - 1169262

Electrical heater for oil wells
- - 1504208

Electric coupling
- - 2306206

Flame boring apparatus
- - 2742555


Inventors:
Williams, Ernest E.
Ward, Bertrand M.
Publication Date:
07/07/1959
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Assignee:
PETRO FLOW CORP
Primary Class:
166/60
Other Classes:
392/301, 439/502
International Classes:
E21B36/04; E21B36/00