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Application filed by Frank Hoffmann, Lausch Andreas, Theo Lauterlein, Fritz PrueferfiledCriticalFrank Hoffmann
Priority to DD20605678ApriorityCriticalpatent/DD138620B1/de
Publication of DD138620A1publicationCriticalpatent/DD138620A1/de
Publication of DD138620B1publicationCriticalpatent/DD138620B1/de