IPC Subgroup
E21C 27/14 breaking-down effected by force or pressure applied to side of slit, e.g. by wedges
Introduced: September 1968
Last revised: January 2006
Full Title
Machines which completely free the mineral from the seam > by both slitting and breaking-down > breaking-down effected by force or pressure applied to side of slit, e.g. by wedges
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING
1 direct subcode
Child Classifications
Navigate with arrow keys, Enter to open
- E21C 27/16 with means for both slitting and breaking-down