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Priority to NL6812024ApriorityCriticalpatent/NL6812024A/xx
Priority to DE19691942138prioritypatent/DE1942138A1/de
Priority to GB4162369Aprioritypatent/GB1240776A/en
Priority to FR6928980Aprioritypatent/FR2016313A1/fr
Publication of NL6812024ApublicationCriticalpatent/NL6812024A/xx