 |
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| four-wing rotary bit | |||
| крестообразное долото вращательного бурения: 6 phrases in 3 subjects |
| Mining | 1 |
| Oil and gas technology | 2 |
| Oilfields | 3 |
|
| |||
| four-wing rotary bit | |||
| крестообразное долото вращательного бурения: 6 phrases in 3 subjects |
| Mining | 1 |
| Oil and gas technology | 2 |
| Oilfields | 3 |