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- OAO "Lukoil-Permneftegaz"
- Udmurtneft
- the Ufa Branch of YuganskNIPIneft
- AOZT "NIINeftehim Pilot-Production Plant"
- AO "EKROS"
- Western Siberian Agency of "Elf-Atokem"
- OAO "Orenburgneft"
- Chernushkaneft (Permneftegaz) OGPD
- Prorvaneft (Tengizneftegaz) OGPD
- Bashneftegazprom
- Fedorovneft (Surgutneftegaz) OGPD
- Las'eganneft OGPD
- Ur'evneft (Lukoil-Langepasneftegaz)
- Joint venture "Van'eganneft"
- Almetevneft and YUNPH OGPD
- "Dzhalilneft" (Tatneft) OGPD
- ANK "Bashneft" OGPD
- OAO "Sibneft-Noyabrskneftegaz"
- OAO "Yuganskneftegaz"
- AO "TNPH"
- AK "Transneft"
- Caspian Pipeline Consortium (CPC)
- AO "Tatneft"
- AO "Ufareaktiv"
- AO "Napor"
- AO "Surgutneftegaz"
- TatNIPIneft Institute
- OrenburgNIPIneft Institute
- AO "Dimetra"
- "Elhovneft"
- AK "Transnefteproduktoprovod"
- OAO "Gazservis"
- OAO "Var'eganneft"
- OAO "Belkamneft"
- "PechorNIPIneft'"
- OAO "Rosneft-Purneftegaz"
- OAO "Orenburgneft"
- ZAO "Kormako"
- OGPD "Komsomolskneft"
- "TNK-Nyagan"
- "Nizhnevartovsk Oil-Production Enterprise"
- "Yugraneft Corporation"
- "Samotlorneftegaz"
- "Saratovneftegaz"
- "TNK-Nizhnevartovsk"
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