IPC Subgroup
E21D 17/01 characterised by the shape of the cap, e.g. of specified cross-section
Introduced: September 1968
Last revised: January 2006
Full Title
Caps for supporting mine roofs > characterised by the shape of the cap, e.g. of specified cross-section
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS