IPC Main Group
E21D 21/00 Anchoring-bolts for roof, floor, or shaft-lining protection
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Related Keywords
ANCHORING -bolts for mining
1 direct subcode
Child Classifications
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- E21D 21/02 having means for indicating tension