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Application filed by Juergen Meyer, Ortwin Dittmer, Fritz MenzelfiledCriticalJuergen Meyer
Priority to DD19803977ApriorityCriticalpatent/DD132682B1/en
Publication of DD132682A1publicationCriticalpatent/DD132682A1/en
Publication of DD132682B1publicationCriticalpatent/DD132682B1/en