299 / | HD | MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL |
10 | PROCESSES {7} | |
11 | DF | .~> Stabilizing underground structure |
12 | DF | .~> Mine safety |
13 | DF | .~> Explosive |
14 | DF | .~> Directly applying heat or vibration |
15 | DF | .~> Forming blocks (e.g., quarrying) |
16 | DF | .~> Breaking down by direct contact with fluid {1} |
18 | DF | .~> With material-handling |