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 Robert Van CaekenberghfiledCriticalRobert Van Caekenbergh
Priority to BE588158ApriorityCriticalpatent/BE588158A/en
Publication of BE588158ApublicationCriticalpatent/BE588158A/en