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Application filed by М. Ф. Волкович и Н. П. КороткийfiledCriticalМ. Ф. Волкович и Н. П. Короткий
Priority to SU772499118ApriorityCriticalpatent/SU654838A1/ru
Application grantedgrantedCritical
Publication of SU654838A1publicationCriticalpatent/SU654838A1/ru