| |||
| advance timbering; cantilever timbering; telescoping support | |||
|
передовое крепление : 8 phrases in 2 subjects |
| Geology | 3 |
| Mining | 5 |
| |||
| advance timbering; cantilever timbering; telescoping support | |||
|
передовое крепление : 8 phrases in 2 subjects |
| Geology | 3 |
| Mining | 5 |