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Priority to JP10545787UpriorityCriticalpatent/JPS6415808U/ja
Priority to US07/216,051prioritypatent/US4889033A/en
Priority to KR2019880011118Uprioritypatent/KR920005430Y1/ko
Publication of JPS6415808UpublicationCriticalpatent/JPS6415808U/ja
