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 GB2459262ApriorityCriticalpatent/GB962845A/en
Priority to US289025Aprioritypatent/US3216668A/en
Application filedfiledCritical
Priority to BE645349Aprioritypatent/BE645349A/fr
Publication of BE645349ApublicationCriticalpatent/BE645349A/fr