IPC Subgroup
E21B 25/16 for obtaining oriented cores
Introduced: January 1980
Last revised: January 2006
Full Title
Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors > for obtaining oriented cores
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