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Priority to JP13244588UpriorityCriticalpatent/JPH0252911U/ja
Priority to CA000586977Aprioritypatent/CA1323533C/en
Priority to US07/290,171prioritypatent/US4911112A/en
Priority to EP88312369Aprioritypatent/EP0323234A1/en
Publication of JPH0252911UpublicationCriticalpatent/JPH0252911U/ja