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Application filed by К.Ф. Фрей, С.П. ЦикинfiledCriticalК.Ф. Фрей
Priority to SU169818ApriorityCriticalpatent/SU46748A1/en
Application grantedgrantedCritical
Publication of SU46748A1publicationCriticalpatent/SU46748A1/en