IPC Subgroup
E21B 3/03 with an intermittent unidirectional rotation of the tool
Introduced: January 2000
Last revised: January 2006
Full Title
Rotary drilling > Surface drives for rotary drilling > with an intermittent unidirectional rotation of the tool
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