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эксплуатируемый трубопровод (An operating pipeline requires control, maintenance and surveillance  concawe.eu MichaelBurov); работающий трубопровод (MichaelBurov) | |||
| operating pipeline: 10 phrases in 5 subjects |
| General | 1 |
| Logistics | 1 |
| Military | 4 |
| Oil and gas | 3 |
| Production | 1 |