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Application filed by В. М. Ковалев, М. Д. Медведев и Л. М. НатаповfiledCriticalВ. М. Ковалев, М. Д. Медведев и Л. М. Натапов
Priority to SU772508624ApriorityCriticalpatent/SU677827A1/ru
Application grantedgrantedCritical
Publication of SU677827A1publicationCriticalpatent/SU677827A1/ru