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Priority to JP1988150513UpriorityCriticalpatent/JPH0270419U/ja
Priority to KR1019890016551Aprioritypatent/KR970011191B1/ko
Priority to US07/438,587prioritypatent/US5023585A/en
Publication of JPH0270419UpublicationCriticalpatent/JPH0270419U/ja
