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 BE794563DpriorityCriticalpatent/BE794563A/xx
Application filedfiledCritical
Priority to NL7201218Aprioritypatent/NL152321B/xx
Priority to DE19732303850prioritypatent/DE2303850C3/de
Priority to FR7302936Aprioritypatent/FR2169380B1/fr
Priority to GB434173Aprioritypatent/GB1422021A/en
Publication of NL7201218ApublicationCriticalpatent/NL7201218A/xx
Priority to US05/660,044prioritypatent/US4175342A/en
Publication of NL152321BpublicationCriticalpatent/NL152321B/xx