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Priority to JP1990077761UpriorityCriticalpatent/JPH0435767U/ja
Priority to KR1019910012451Aprioritypatent/KR950008066B1/ko
Publication of JPH0435767UpublicationCriticalpatent/JPH0435767U/ja
Priority to US07/963,287prioritypatent/US5291683A/en
