IPC Subgroup
E21B 10/26 Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
Introduced: January 1980
Last revised: January 2006
Full Title
Drill bits > Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
Scope Notes
Limiting references: Percussion drill bits with leading portion
Related Keywords
deep drilling UNDER-REAMERS
2 direct subcodes
Child Classifications
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- E21B 10/28 with non-expansible roller cutters
- E21B 10/32 with expansible cutting tools