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Application filed by М.Х. Бергольц, Б.Ф. ГуберманfiledCriticalМ.Х. Бергольц
Priority to SU15023ApriorityCriticalpatent/SU74961A1/en
Application grantedgrantedCritical
Publication of SU74961A1publicationCriticalpatent/SU74961A1/en