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 G De RuiterfiledCriticalG De Ruiter
Priority to BE598487ApriorityCriticalpatent/BE598487A/en
Publication of BE598487ApublicationCriticalpatent/BE598487A/en