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 Walther FeldfiledCriticalWalther Feld
Priority to AT57415DpriorityCriticalpatent/AT57415B/en
Priority to AT57416Dprioritypatent/AT57416B/en
Application grantedgrantedCritical
Publication of AT52351BpublicationCriticalpatent/AT52351B/en