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Priority to JP14760889UpriorityCriticalpatent/JPH0389571U/ja
Priority to US07/500,454prioritypatent/US5014143A/en
Priority to KR1019900004301Aprioritypatent/KR0180231B1/ko
Publication of JPH0389571UpublicationCriticalpatent/JPH0389571U/ja