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Priority to NL6701804ApriorityCriticalpatent/NL142777B/xx
Priority to GB586868Aprioritypatent/GB1175304A/en
Priority to BE710360Dprioritypatent/BE710360A/xx
Priority to DE19681753187prioritypatent/DE1753187A1/de
Publication of NL6701804ApublicationCriticalpatent/NL6701804A/xx
Publication of NL142777BpublicationCriticalpatent/NL142777B/xx