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Application filed by М.Ф. Аверина, Г.Б. ДубовскийfiledCriticalМ.Ф. Аверина
Priority to SU177684ApriorityCriticalpatent/SU50207A1/en
Application grantedgrantedCritical
Publication of SU50207A1publicationCriticalpatent/SU50207A1/en