- OAO "Dorogobuzhkotlomash"
| Russie | - Obedinenie Progress, ZAO
| Russie | - Obninsky molochny zavod, OAO
| Russie | - Oboronhim, PO
| Russie | - Oboznik, ZAO
| Russie | - Obuvnoe predpriyatie "Nevel", OOO
| Russie | - Ochakovsky zavod ZHBK GAO "Mosmetrostroy", ZAO
| Russie | - Ochersky mashinostroitelny zavod, OAO
| Russie | - Odincovskaya konditerskaya fabrika, OOO
| Russie | - Odincovsky lakokrasochny zavod, OAO
| Russie | - Ohtinsky zavod poroshkovyh krasok
| Russie | - Okna Koloron, OOO
| Russie | - OKNA-PLYUS, OOO
| Russie | - OKS 01, ZAO
| Russie | - Oktava, OAO
| Russie | - Oleokam, PF
| Russie | - OLIMP IMPERIAL, OOO
| Russie | - Olivesta (Moskovsky zavod "Lakokraska") , AOZT
| Russie | - Olkom, ZAO
| Russie | - Omsktransmash, GUP
| Russie | - Oniks-3, ZAO
| Russie | - OOO "PKF Galreahim"
| Russie | - Optima - teks, ZAO
| Russie | - Opytno-eksperimentalny zavod zhelezobetonnyh konstrukcy
| Russie | - OPYTNOE-stroysertifikaciya
| Russie | - Opytny elektromontazhny zavod, OAO
| Ukraine | - Opytny mehanichesky zavod, filial AOZT "Mezhgorsvyazstroy"
| Russie | - Opytny mehanichesky zavod, OAO
| Russie | - Opytny zavod suhih smesey, AOOT
| Russie | - Opytny zavod, AOOT
| Russie | - Orel - Pogruzchik, JSC
| Russie | - Orelpishemash PKC , OOO
| Russie | - Orelstroymash, OAO
| Russie | - Orenstein & Koppel, AG
| Allemagne | - Oreshkinsky kombinat nerudnyh stroitelnyh materialov, OOO
| Russie | - Orgenergogaz, DOAO
| Russie | - Orgstroy, OOO
| Russie | - Orgstroyekspert
| Russie | - Orgstroysertifikaciya
| Russie | - Orgtehstroy-1, ZAO
| Russie | - Orion, NTC
| Russie | - ORLEX, ZAO
| Russie | - Orlovsky zavod "Steklomash", OAO
| Russie | - Orlovsky zavod dorozhnyh mashin, OAO
| Russie | - Orshaagroprommash, OAO
| Biélorussie | - OSKBES MAI
| Russie | - OST-ALKO, OOO.
| Russie | - Ostrovsky zavod elektricheskih mashin, OAO
| Russie | - Otopitelnyh priborov
| Russie | - OVESI Administracii Ryazanskoy oblasti
| Russie | - OZTP-Sarmat, OAO
| Russie |
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