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Priority to JP4284990UpriorityCriticalpatent/JPH0472471U/ja
Priority to US07/685,656prioritypatent/US5167528A/en
Priority to KR2019910005474Uprioritypatent/KR940007695Y1/ko
Publication of JPH0472471UpublicationCriticalpatent/JPH0472471U/ja