IPC Subgroup
E21C 41/26 Methods of surface mining; Layouts therefor
Introduced: January 1990
Last revised: January 2006
Full Title
Methods of underground or surface mining; Layouts therefor > Methods of surface mining; Layouts therefor
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING
Related Keywords
mining LIGNITE
2 direct subcodes
Child Classifications
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- E21C 41/28 for brown or hard coal
- E21C 41/3 for ores, e.g. mining placers