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Priority to JP1989136347UpriorityCriticalpatent/JPH0375497U/ja
Priority to US07/615,474prioritypatent/US5189241A/en
Priority to KR1019900019073Aprioritypatent/KR940007134B1/ko
Publication of JPH0375497UpublicationCriticalpatent/JPH0375497U/ja