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Application filed by Lothar Ledermann, Guenter Kleinschmidt, Joachim Rost, Helmut Weissenborn, Willy HofmannfiledCriticalLothar Ledermann
Priority to DD20538078ApriorityCriticalpatent/DD136790A1/de
Publication of DD136790A1publicationCriticalpatent/DD136790A1/de