Title:
Well device
Document Type and Number:
United States Patent 2371840

Inventors:
Otis, Herbert C.
Publication Date:
03/20/1945
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Assignee:
Otis, Herbert C.
Primary Class:
166/126
Other Classes:
166/149, 166/129, 166/387, 166/140, 166/268
International Classes:
E21B33/129; E21B33/12




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