Diamond drill bit
United States Patent 2911196
US Patent References:
Rotary drill bit
- - 1814296

Well drill
- - 1858282

/2511831.html
- - 2511831

Full hole diamond bit
- - 2667334


Inventors:
Cameron, Harry M.
Haffner, Bernhard K.
Publication Date:
11/03/1959
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Assignee:
AMERICAN COLDSET CORP
Primary Class:
175/336
Other Classes:
175/374, 175/348, 175/376, 175/339, 175/434
International Classes:
E21B10/14; E21B10/50; E21B10/08; E21B10/46