Deep well drill bit
United States Patent 2124521

Inventors:
Williams, Clinton F.
Hans, Gruner
Publication Date:
07/19/1938
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Assignee:
WILLIAMS IRON WORKS COMPANY
Primary Class:
175/366
Other Classes:
175/340, 175/372, 175/336, 175/349
International Classes:
E21B10/08; E21B10/28; E21B10/26