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Application grantedgrantedCritical
Publication of SU53647A1publicationCriticalpatent/SU53647A1/ru
Application filed by М.М. Звягин, гин М.М. ЗвfiledCriticalМ.М. Звягин
Priority to SU1872ApriorityCriticalpatent/SU69884A1/ru
Publication of SU69884A1publicationCriticalpatent/SU69884A1/ru