Title:
Oil-well heater
United States Patent 1776997
Inventors:
Downey, Patrick V.
Publication Date:
09/30/1930
Export Citation:
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Assignee:
Downey, Patrick V.
Primary Class:
166/60
Other Classes:
392/305, 392/306, 417/109
International Classes:
E21B36/04; E21B36/00
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