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Application filed by Horst Witt, Wider Hans Wilhelm, Karl StumpffiledCriticalHorst Witt
Priority to DD19647076ApriorityCriticalpatent/DD128885B1/en
Publication of DD128885A1publicationCriticalpatent/DD128885A1/en
Publication of DD128885B1publicationCriticalpatent/DD128885B1/en