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| устьевое оборудование; фонтанная арматура | |||
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井 口装置 : 32 phrases in 7 subjects |
| Drilling | 4 |
| General | 5 |
| Mining | 1 |
| Oil / petroleum | 5 |
| Oil and gas | 1 |
| Oilfields | 15 |
| Technology | 1 |
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