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 BE675493DpriorityCriticalpatent/BE675493A/fr
Priority to NL130538Dprioritypatent/NL130538C/xx
Application filedfiledCritical
Priority to NL6601272Aprioritypatent/NL6601272A/xx
Publication of NL6601272ApublicationCriticalpatent/NL6601272A/xx