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| обратный клапан обсадной колонны: 20 phrases in 8 subjects |
| Drilling | 1 |
| Mining | 1 |
| Oil / petroleum | 7 |
| Oil and gas | 1 |
| Oil and gas technology | 2 |
| Oilfields | 1 |
| Sakhalin | 6 |
| Technology | 1 |
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