Title:
Core bit
Document Type and Number:
United States Patent 2371488

Inventors:
Williams Jr., Edward B.
Publication Date:
03/13/1945
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Assignee:
Howard, Grubb C.
Sam, Daniel P.
Primary Class:
175/405.100
Other Classes:
175/315
International Classes:
E21B10/00; E21B10/48; E21B10/46




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