 |
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| зубья долота с полусферической рабочей поверхностью | |||
| bit teeth with hemispherical working surface: 2 phrases in 2 subjects |
| Oil and gas technology | 1 |
| Oilfields | 1 |
|
| |||
| зубья долота с полусферической рабочей поверхностью | |||
| bit teeth with hemispherical working surface: 2 phrases in 2 subjects |
| Oil and gas technology | 1 |
| Oilfields | 1 |