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Application filed by А.Ф. Кирьянов, нов А.Ф. КирьfiledCriticalА.Ф. Кирьянов
Priority to SU117579ApriorityCriticalpatent/SU31270A1/en
Application grantedgrantedCritical
Publication of SU31270A1publicationCriticalpatent/SU31270A1/en