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Application filed by Д.Э. Беленький, Н.Н. ПоповаfiledCriticalД.Э. Беленький
Priority to SU111716ApriorityCriticalpatent/SU32908A1/en
Application grantedgrantedCritical
Publication of SU32908A1publicationCriticalpatent/SU32908A1/en