| |||
| Pfeilerbau m (method); Pfeilerbauverfahren n (method); Kammerpfeilerbau m (method) | |||
|
stoop-and-room : 2 phrases in 1 subject |
| Mining | 2 |
| |||
| Pfeilerbau m (method); Pfeilerbauverfahren n (method); Kammerpfeilerbau m (method) | |||
|
stoop-and-room : 2 phrases in 1 subject |
| Mining | 2 |