 |
| |||
| air-operated downhole percussion drill; air-operated percussion motor | |||
| пневматический ударный забойный двигатель: 3 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Oilfields | 1 |
|
| |||
| air-operated downhole percussion drill; air-operated percussion motor | |||
| пневматический ударный забойный двигатель: 3 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Oilfields | 1 |