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Priority to JP1990074316UpriorityCriticalpatent/JPH0433171U/ja
Priority to US07/728,606prioritypatent/US5172643A/en
Priority to KR1019910012158Aprioritypatent/KR970006655B1/ko
Publication of JPH0433171UpublicationCriticalpatent/JPH0433171U/ja