IPC Subgroup
E21B 31/06 using magnetic means
Introduced: September 1968
Last revised: January 2006
Full Title
Fishing for or freeing objects in boreholes or wells > using magnetic means
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