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 BE662509DpriorityCriticalpatent/BE662509A/fr
Application filedfiledCritical
Priority to NL6503978Aprioritypatent/NL6503978A/xx
Publication of NL6503978ApublicationCriticalpatent/NL6503978A/xx