IPC Main Group
E21C 27/00 Machines which completely free 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
BREAKING -down of minerals from the seamSAW(S) for mining or quarrying
5 direct subcodes
Child Classifications
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- E21C 27/01 specially adapted for removing overhanging coal
- E21C 27/02 solely by slitting
- E21C 27/1 by both slitting and breaking-down
- E21C 27/18 by both slitting and planing
- E21C 27/2 Mineral freed by means not involving slitting