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Publication of SU1267A1publicationCriticalpatent/SU1267A1/en
Application filed by А.А. ЧепурновfiledCriticalА.А. Чепурнов
Priority to SU77768ApriorityCriticalpatent/SU22579A1/en
Priority claimed from SU77768Aexternal-prioritypatent/SU22579A1/en
Application grantedgrantedCritical
Publication of SU22579A1publicationCriticalpatent/SU22579A1/en