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Application filed by М.М. Михайлов, К.И. Черняк, к К.И. ЧернfiledCriticalМ.М. Михайлов
Priority to SU388376ApriorityCriticalpatent/SU76845A1/ru
Application grantedgrantedCritical
Publication of SU76845A1publicationCriticalpatent/SU76845A1/ru