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Application filed by Ю.Н. Вольнов, Б.Н. ДашкевичfiledCriticalЮ.Н. Вольнов
Priority to SU184616ApriorityCriticalpatent/SU48289A1/ru
Application grantedgrantedCritical
Publication of SU48289A1publicationCriticalpatent/SU48289A1/ru