Well tubing heater system
United States Patent 2781851
US Patent References:
Oil well heater
- - 1864960

Oil well heater
- - 2632836


Inventors:
Smith, Grafton A.
Publication Date:
02/19/1957
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Assignee:
Shell, Dev
Primary Class:
166/60
Other Classes:
392/301
International Classes:
E21B36/04; E21B36/00