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Priority to JP1988131085UpriorityCriticalpatent/JPH0251732U/ja
Priority to KR1019890014238Aprioritypatent/KR930007631B1/ko
Priority to US07/417,116prioritypatent/US4989704A/en
Publication of JPH0251732UpublicationCriticalpatent/JPH0251732U/ja
