 |
| |||
| four-wing rotary bit | |||
| крестообразное долото для вращательного бурения: 5 phrases in 2 subjects |
| Oil and gas technology | 2 |
| Oilfields | 3 |
|
| |||
| four-wing rotary bit | |||
| крестообразное долото для вращательного бурения: 5 phrases in 2 subjects |
| Oil and gas technology | 2 |
| Oilfields | 3 |