| 299 / | HD | MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL |
| 29 | DF | HARD MATERIAL DISINTEGRATING MACHINES {17} |
| 42 | DF | .~ Sidewall-working (e.g., drum-type cutter) {4} |
| 43 | DF | .~.~ With material-handling means {3} |
| 44 | ![]() | .~.~.~ Undercutting, dislodging and conveying |