Method and apparatus for completing wells
United States Patent 2150887

Inventors:
Mueller, Robert A.
Roger, Smith
Publication Date:
03/14/1939
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Assignee:
GRAY TOOL CO
Primary Class:
166/379
Other Classes:
166/76.100, 277/329, 166/86.200
International Classes:
E21B33/06; E21B33/03