IPC Subgroup
E21C 25/58 Machines slitting by drilling hole on hole
Introduced: September 1968
Last revised: January 2006
Full Title
Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam > Machines slitting by drilling hole on hole
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- MINING OR QUARRYING