 |
| |||
| Belgian method of tunneling; two-stage excavation method | |||
| abutment arch method (lxu5) | |||
| способ опёртого свода: 5 phrases in 2 subjects |
| Construction | 1 |
| Mining | 4 |
|
| |||
| Belgian method of tunneling; two-stage excavation method | |||
| abutment arch method (lxu5) | |||
| способ опёртого свода: 5 phrases in 2 subjects |
| Construction | 1 |
| Mining | 4 |