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 Karl August DuppengiesserfiledCriticalKarl August Duppengiesser
Priority to BE591125ApriorityCriticalpatent/BE591125A/fr
Publication of BE591125ApublicationCriticalpatent/BE591125A/fr