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Priority to JP1988090597UpriorityCriticalpatent/JPH0213988U/ja
Priority to KR1019890009660Aprioritypatent/KR970002650B1/ko
Priority to US07/377,252prioritypatent/US4953362A/en
Publication of JPH0213988UpublicationCriticalpatent/JPH0213988U/ja