| |||
air shaft | |||
air pit; bypit; fan shaft; tron; windhole | |||
by-pass pit; airshaft; air well; cold pit; discharge air shaft | |||
ventilation shaft; ventilating shaft; trunk; trunkway |
Wetterschacht : 7 phrases, 2 sujets |
Exploitation minière | 6 |
Métallurgie | 1 |