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Video for preparation for the Rostekhnadzor exam on electrical safety. Autonomous non-profit organization of additional professional education "Educational center" PetroProf "(ANO DPO "OC" PetroProf ") +7 (812) 441-34-50, +7 (911) 958-958-8 https://vk.com/petroprof http://www.petroprofa.ru/