IPC Main Group
E21C 39/00 Devices for testing the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING