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.)
Publication of NL279672ApublicationCriticalpatent/NL279672A/xx
Priority claimed from DEST15862Aexternal-prioritypatent/DE1112109B/de
Priority claimed from DEST17942Aexternal-prioritypatent/DE1168959B/de