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Application filed by М.К. Елисеев, А.Я. ЛедковfiledCriticalМ.К. Елисеев
Priority to SU392260ApriorityCriticalpatent/SU77076A1/ru
Application grantedgrantedCritical
Publication of SU77076A1publicationCriticalpatent/SU77076A1/ru