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Priority to JP1990068047UpriorityCriticalpatent/JPH0426472U/ja
Priority to US07/720,992prioritypatent/US5209426A/en
Priority to KR1019910010748Aprioritypatent/KR950000571B1/ko
Priority to EP19910110685prioritypatent/EP0464687A3/en
Publication of JPH0426472UpublicationCriticalpatent/JPH0426472U/ja