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| casing valve (Xmas MichaelBurov) | |||
| casing valve (andrushin) | |||
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| annulus valves (фонтанная арматура Leonid Dzhepko) | |||
| затрубная задвижка: 11 phrases in 5 subjects |
| Drilling | 4 |
| General | 1 |
| Oil / petroleum | 2 |
| Oil and gas technology | 2 |
| Oilfields | 2 |
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