 |
| |||
| advancing face | |||
| advancing mining | |||
| gob-road system | |||
|
exploitation chassante : 7 phrases, 2 sujets |
| Charbon | 1 |
| Métallurgie | 6 |
|
| |||
| advancing face | |||
| advancing mining | |||
| gob-road system | |||
|
exploitation chassante : 7 phrases, 2 sujets |
| Charbon | 1 |
| Métallurgie | 6 |