IPC Main Group
E21B 3/00 Rotary drilling
Introduced: September 1968
Last revised: January 2006
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
Related Keywords
drilling machines or AUGERS for mining or quarrying
1 direct subcode
Child Classifications
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- E21B 3/02 Surface drives for rotary drilling