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 Abr & Gebr Frowein, Biernatzki & CompfiledCriticalAbr & Gebr Frowein
Publication of CH1226ApublicationCriticalpatent/CH1226A/en