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| tubing-retrievable safety valve | |||
| tubing retrievable subsurface safety valve | |||
| TRSV (tubing-retrievable safety valve serebrin) | |||
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скважинный клапан -отсекатель шарикового типа : 6 phrases in 2 subjects |
| Drilling | 4 |
| Oil / petroleum | 2 |
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