IPC Subgroup
E21B 11/06 with driven cutting chains or similarly-driven tools
Introduced: September 1968
Last revised: January 2006
Full Title
Other drilling tools > with driven cutting chains or similarly-driven tools
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