IPC Subgroup
E21D 1/03 mechanically
Introduced: September 1968
Last revised: January 2006
Full Title
Sinking shafts > mechanically
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
2 direct subcodes
Child Classifications
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