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Priority to JP8223390UpriorityCriticalpatent/JP2503805Y2/ja
Priority to US07/728,606prioritypatent/US5172643A/en
Priority to KR1019910012158Aprioritypatent/KR970006655B1/ko
Publication of JPH0440371UpublicationCriticalpatent/JPH0440371U/ja
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Publication of JP2503805Y2publicationCriticalpatent/JP2503805Y2/ja