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 filedfiledCritical
Priority to NL6808881ApriorityCriticalpatent/NL6808881A/xx
Priority to GB30205/68Aprioritypatent/GB1224382A/en
Priority to BE717122Dprioritypatent/BE717122A/xx
Publication of NL6808881ApublicationCriticalpatent/NL6808881A/xx