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Priority to NL6811818ApriorityCriticalpatent/NL6811818A/xx
Priority to DE19691938690prioritypatent/DE1938690A1/de
Priority to FR6928035*7Aprioritypatent/FR2016970A1/fr
Priority to JP44064659Aprioritypatent/JPS4839859B1/ja
Priority to BE737629Dprioritypatent/BE737629A/xx
Publication of NL6811818ApublicationCriticalpatent/NL6811818A/xx