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Priority to NL6616832ApriorityCriticalpatent/NL6616832A/xx
Priority to GB5124767Aprioritypatent/GB1181970A/en
Priority to DE19671582224prioritypatent/DE1582224A1/de
Priority to FR129549Aprioritypatent/FR1545288A/fr
Publication of NL6616832ApublicationCriticalpatent/NL6616832A/xx