IPC Subgroup
E21C 37/1 Devices with expanding elastic casings
Introduced: September 1968
Last revised: January 2006
Full Title
Other methods or devices for dislodging with or without loading > by making use of hydraulic or pneumatic pressure in a borehole > Devices with expanding elastic casings
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING