Method and apparatus for producing oil wells
United States Patent 2593497

Inventors:
Ralph, Spearow
Publication Date:
04/22/1952
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Assignee:
Ralph, Spearow
Primary Class:
Other Classes:
166/306, 166/74, 166/115, 166/68, 166/305.100, 166/297
International Classes:
E21B43/16; E21B43/18