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 DE1907197503Dexternal-prioritypatent/DE197503C/de
Application filed by Heinrich Knapp, Paul Gerhardt HoffmannfiledCriticalHeinrich Knapp
Application grantedgrantedCritical
Publication of AT35327BpublicationCriticalpatent/AT35327B/de