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 Graaff & Compagnie Ges Mit BesfiledCriticalGraaff & Compagnie Ges Mit Bes
Publication of CH36984ApublicationCriticalpatent/CH36984A/en