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Priority claimed from DD13771969Aexternal-prioritypatent/DD73075A1/xx
Priority claimed from DD13776469Aexternal-prioritypatent/DD72300A1/xx
Application filed by Veb Transformatorenwerk Karl LiewknechtfiledCriticalVeb Transformatorenwerk Karl Liewknecht
Publication of BG20631A3publicationCriticalpatent/BG20631A3/xx