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Priority to JP1987168441UpriorityCriticalpatent/JPH0173726U/ja
Priority to KR2019880011568Uprioritypatent/KR910003721Y1/ko
Priority to US07/228,664prioritypatent/US4935591A/en
Publication of JPH0173726UpublicationCriticalpatent/JPH0173726U/ja