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Priority to JP1989103631UpriorityCriticalpatent/JPH0345217U/ja
Priority to US07/453,933prioritypatent/US5136565A/en
Priority to KR1019890019031Aprioritypatent/KR0153766B1/ko
Publication of JPH0345217UpublicationCriticalpatent/JPH0345217U/ja