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 Karl Speicher, Helmut Schatton, Eberhard EiserbeckfiledCriticalKarl Speicher
Priority to DD20565378ApriorityCriticalpatent/DD136776B1/de
Publication of DD136776A1publicationCriticalpatent/DD136776A1/de
Publication of DD136776B1publicationCriticalpatent/DD136776B1/de