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 date
Priority to AT715DpriorityCriticalpatent/AT715B/de
Priority to AT718Dprioritypatent/AT718B/de
Application grantedgrantedCritical
Publication of AT578BpublicationCriticalpatent/AT578B/de