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Application filed by Werner Lauterberg, Otto Wittenburg, Werner Taube, Herbert SteinmetzerfiledCriticalWerner Lauterberg
Priority to DD20518474ApriorityCriticalpatent/DD136238B1/en
Publication of DD136238A1publicationCriticalpatent/DD136238A1/en
Publication of DD136238B1publicationCriticalpatent/DD136238B1/en