IPC Subgroup
E21C 27/2 Mineral freed by means not involving slitting
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
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING
7 direct subcodes
Child Classifications
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- E21C 27/22 by rotary drills with breaking-down means, e.g. wedge-shaped drills
- E21C 27/24 by milling means acting on the full working face
- E21C 27/26 by closely adjacent cutter chains acting on the full working face
- E21C 27/28 by percussive drills with breaking-down means, e.g. wedge-shaped tools
- E21C 27/3 by jaws, buckets, or scoops that scoop-out the mineral
- E21C 27/32 by adjustable or non-adjustable planing means with or without loading arrangements
- E21C 27/46 by percussed planing means