Tool useful for removing objects from wells
United States Patent 2190442

Inventors:
Costello, Charles E.
Publication Date:
02/13/1940
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Assignee:
William, Collins B.
Walter, Boggs W.
John, Costello W.
Primary Class:
166/98
Other Classes:
166/152, 294/86.160, 166/237, 277/342, 166/186, 166/119, 294/86.210, 166/147
International Classes:
E21B31/107; E21B31/00