United States Patent 3126067
US Patent References:
/1143272.html
- - 1143272

Rotary disk
- - 1656022

Rock bit cone
- - 1840390

Well bit
- - 2255435

Drilling bit
- - 2634105


Publication Date:
03/24/1964
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Primary Class:
175/374
Other Classes:
175/379
International Classes:
E21B10/16; E21B10/52; E21B10/08; E21B10/46
US Patent References:
2774571Cone type well drill
2804282Boring drill
2833520Annular mill for use in oil wells