Title:
Shear-reducing, dual verge thread for tool joints, etc.
United States Patent 2267923

Inventors:
Johnson, Arthur E.
Publication Date:
12/30/1941
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Assignee:
Johnson, Arthur E.
Primary Class:
285/334
Other Classes:
411/436
International Classes:
F16B33/02; F16L15/06; F16B33/00; F16L15/00