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Application filed by М. Е. Плетнев, М. Е. Плетнев , В. С. Скворцов, В. С. СкворцовfiledCriticalМ. Е. Плетнев
Priority to SU1762872ApriorityCriticalpatent/SU412684A3/ru
Application grantedgrantedCritical
Publication of SU412684A3publicationCriticalpatent/SU412684A3/ru
Publication of SU412684A1publicationCriticalpatent/SU412684A1/ru