Title:
Integral joint drill pipe
Document Type and Number:
United States Patent 2246038
Inventors:
Graham, Herbert W.
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Publication Date:
06/17/1941
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Referenced by:
Export Citation:
Assignee:
JONES & LAUGHLIN STEEL CORP
Primary Class:
Other Classes:
138/177, 285/390, 148/320, 266/130
International Classes:
E21B17/00