IPC Subgroup
E21B 10/48 the bit being of core type
Introduced: January 1980
Last revised: January 2006
Full Title
Drill bits > characterised by wear resisting parts, e.g. diamond inserts > the bit being of core type
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