Subsurface speed-up drilling mechanism
United States Patent 2151646

Inventors:
Philip, Subkow
Lyle, Dillon
Publication Date:
03/21/1939
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Assignee:
UNION OIL CO
Primary Class:
175/325.200
Other Classes:
175/338, 175/292, 175/273
International Classes:
E21B3/00; E21B4/00; E21B23/00