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Application filed by Eckardt Armin, Beyer Gerd, Gerhard WagnerfiledCriticalEckardt Armin
Priority to DD20520278ApriorityCriticalpatent/DD136385B1/de
Publication of DD136385A1publicationCriticalpatent/DD136385A1/de
Publication of DD136385B1publicationCriticalpatent/DD136385B1/de