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 Pfeiffer, Lothar Richter, Peter MoeserfiledCriticalHans Pfeiffer
Publication of CS669785A1publicationCriticalpatent/CS669785A1/cs
Publication of CS259047B1publicationCriticalpatent/CS259047B1/cs