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Priority to JP6639189UpriorityCriticalpatent/JPH034674U/ja
Priority to CA002018400Aprioritypatent/CA2018400C/en
Priority to GB9012654Aprioritypatent/GB2233170B/en
Priority to US07/534,640prioritypatent/US5044967A/en
Publication of JPH034674UpublicationCriticalpatent/JPH034674U/ja