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Application filed by Rudolf Breitkopf, Wilhelm Nowak, Peter Pretzsch, Werner GiesefiledCriticalRudolf Breitkopf
Priority to DD22456680ApriorityCriticalpatent/DD154422A3/de
Priority to SU817771941Aprioritypatent/SU1301369A1/ru
Publication of DD154422A3publicationCriticalpatent/DD154422A3/de