Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Helmut Kempf, Lothar Rockrohr, Guenther TeichmannfiledCriticalHelmut Kempf
Priority to DD20726078ApriorityCriticalpatent/DD138700A2/en
Publication of DD138700A2publicationCriticalpatent/DD138700A2/en