IPC Subgroup
E21B 15/04 specially adapted for directional drilling, e.g. slant hole rigs
Introduced: January 1980
Last revised: January 2006
Full Title
Supports for the drilling machine, e.g. derricks or masts > specially adapted for directional drilling, e.g. slant hole rigs
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