 |
| |||
| delivery drift; drain tunnel; drainage gallery; drainage tunnel; free-drainage level; gallery of efflux; jack head; jackhead; off-take drift (level) | |||
| Wasserlösungsstollen: 1 phrase in 1 subject |
| Mining | 1 |
|
| |||
| delivery drift; drain tunnel; drainage gallery; drainage tunnel; free-drainage level; gallery of efflux; jack head; jackhead; off-take drift (level) | |||
| Wasserlösungsstollen: 1 phrase in 1 subject |
| Mining | 1 |