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| lower master valve (TEOC) | |||
| нижняя задвижка: 14 phrases in 6 subjects |
| Drilling | 2 |
| Oil / petroleum | 1 |
| Oil and gas | 3 |
| Sakhalin | 6 |
| Sakhalin A | 1 |
| Sakhalin R | 1 |
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