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
Priority claimed from DESCH29953Aexternal-prioritypatent/DE1265674B/en
Application filed by Walter ScheffelfiledCriticalWalter Scheffel
Application grantedgrantedCritical
Publication of BE619697RpublicationCriticalpatent/BE619697R/en