IPC Main Group
E21C 29/00 Propulsion of machines for slitting or completely freeing the mineral from the seam
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING
Related Keywords
CABLE(S) propulsion for mining machines
3 direct subcodes
Child Classifications
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- E21C 29/02 by means on the machine exerting a thrust against fixed supports
- E21C 29/04 by cable or chains
- E21C 29/22 by wheels, endless tracks, or the like