Title:
Blade-type drill bit
Document Type and Number:
United States Patent 3153458
Inventors:
William, Short Lot
Plaque It!
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Publication Date:
10/20/1964
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Referenced by:
Export Citation:
Assignee:
DRILLING & SERVICE INC
Primary Class:
Other Classes:
175/399
International Classes:
E21B10/54; E21B10/60; E21B10/00; E21B10/46
US Patent References:
Foreign References:
| FR1249346A |