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Priority to JP1988131084UpriorityCriticalpatent/JPH0251731U/ja
Priority to KR1019890014238Aprioritypatent/KR930007631B1/ko
Priority to US07/417,116prioritypatent/US4989704A/en
Publication of JPH0251731UpublicationCriticalpatent/JPH0251731U/ja
