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Priority to JP1988048273UpriorityCriticalpatent/JPH01160868U/ja
Priority to US07/332,608prioritypatent/US4980219A/en
Priority to KR1019890004474Aprioritypatent/KR920005451B1/ko
Publication of JPH01160868UpublicationCriticalpatent/JPH01160868U/ja
Priority to US07/580,262prioritypatent/US5019209A/en