IPC Subgroup
E21C 27/46 by percussed planing means
Introduced: September 1968
Last revised: January 2006
Full Title
Machines which completely free the mineral from the seam > Mineral freed by means not involving slitting > by percussed planing means
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING