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 Hans Zabel, Eberius Karl Ernst, Armin HammermannfiledCriticalHans Zabel
Priority to DD19447776ApriorityCriticalpatent/DD128475B1/en
Publication of DD128475A1publicationCriticalpatent/DD128475A1/en
Publication of DD128475B1publicationCriticalpatent/DD128475B1/en