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 to BE627994DpriorityCriticalpatent/BE627994A/fr
Application filedfiledCritical
Priority to BE640009Aprioritypatent/BE640009A/xx
Publication of BE640009ApublicationCriticalpatent/BE640009A/xx