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| клапан отсекателя (MichaelBurov) | |||
| забойный клапан-отсекатель | |||
| скважинный предохранительный клапан; забойный предохранительный клапан | |||
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downhole safety valve : 4 phrases in 3 subjects |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Oilfields | 1 |
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