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 Frank RijsdijkfiledCriticalFrank Rijsdijk
Priority to BE597920ApriorityCriticalpatent/BE597920A/en
Publication of BE597920ApublicationCriticalpatent/BE597920A/en