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Application filed by Ф.Е. Азарх, Е.А. НисневичfiledCriticalФ.Е. Азарх
Priority to SU380232ApriorityCriticalpatent/SU75640A1/en
Application grantedgrantedCritical
Publication of SU75640A1publicationCriticalpatent/SU75640A1/en