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Application filed by Guenther Ketschau, Volker Schubert, Klaus HungerfiledCriticalGuenther Ketschau
Priority to DD20586278ApriorityCriticalpatent/DD137004A1/en
Priority to DE2919018Aprioritypatent/DE2919018A1/en
Publication of DD137004A1publicationCriticalpatent/DD137004A1/en