Title:
Drill bit
United States Patent 3416617


Inventors:
Elenburg, Wayland D.
Application Number:
US57405466A
Publication Date:
12/17/1968
Filing Date:
08/22/1966
Assignee:
WALKER NEER MFG COMPANY INC
Primary Class:
International Classes:
E21B21/12
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US Patent References:
3292719Drill bit1966-12-20
3208539Apparatus for drilling wells1965-09-28
2093633Core drill1937-09-21
1582332Roller-bits drilling tool1926-04-27
1263802N/A1918-04-23
1256694N/A1918-02-19