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Application filed by Richard Bierwisch, Ulrich Rothhagen, Artur WilkefiledCriticalRichard Bierwisch
Priority to DD19420676ApriorityCriticalpatent/DD128031B1/en
Publication of DD128031A1publicationCriticalpatent/DD128031A1/en
Publication of DD128031B1publicationCriticalpatent/DD128031B1/en