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Application filed by Helmut Rentzsch, Guenther Janka, Wolf Hans DieterfiledCriticalHelmut Rentzsch
Priority to DD19542876ApriorityCriticalpatent/DD128920B1/de
Publication of DD128920A2publicationCriticalpatent/DD128920A2/de
Publication of DD128920B1publicationCriticalpatent/DD128920B1/de