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 Rheinisch Westfaelische StrengfiledCriticalRheinisch Westfaelische Streng
Publication of CH56278ApublicationCriticalpatent/CH56278A/de