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Priority to NL7002895ApriorityCriticalpatent/NL7002895A/xx
Priority to DE19712105154prioritypatent/DE2105154A1/de
Priority to AT161471Aprioritypatent/AT307532B/de
Priority to FR7106480Aprioritypatent/FR2080823B3/fr
Publication of NL7002895ApublicationCriticalpatent/NL7002895A/xx