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Application filed by Niels Ketscher, Hans Grossmann, Jochem Gross, Rainer PfaufiledCriticalNiels Ketscher
Priority to DD19650476ApriorityCriticalpatent/DD128927B2/de
Publication of DD128927A2publicationCriticalpatent/DD128927A2/de
Publication of DD128927B2publicationCriticalpatent/DD128927B2/de