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Application filed by Karl Speicher, Guenter Stephan, Gerd BorkfiledCriticalKarl Speicher
Priority to DD20358778ApriorityCriticalpatent/DD136279B1/de
Publication of DD136279A1publicationCriticalpatent/DD136279A1/de
Publication of DD136279B1publicationCriticalpatent/DD136279B1/de