IPC Subgroup
E21B 1/2 formed as centrifugal hammers
Introduced: January 2000
Last revised: January 2006
Full Title
Percussion drilling > with a reciprocating impulse member > driven by a rotating mechanism > formed as centrifugal hammers
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