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Application filed by Н. В. Молочников, И. М. Елинсон , М. Д. ФилипповfiledCriticalН. В. Молочников, И. М. Елинсон , М. Д. Филиппов
Priority to SU1217169ApriorityCriticalpatent/SU261411A1/ru
Application grantedgrantedCritical
Publication of SU261411A1publicationCriticalpatent/SU261411A1/ru