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Priority to JP1987172266UpriorityCriticalpatent/JPH0176996U/ja
Priority to US07/200,035prioritypatent/US5121785A/en
Priority to KR1019880006533Aprioritypatent/KR890000755A/ko
Publication of JPH0176996UpublicationCriticalpatent/JPH0176996U/ja