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Priority to JP13619788UpriorityCriticalpatent/JPH0520457Y2/ja
Priority to US07/421,069prioritypatent/US5021701A/en
Priority to KR1019890015035Aprioritypatent/KR920003863B1/ko
Publication of JPH0257169UpublicationCriticalpatent/JPH0257169U/ja
Application grantedgrantedCritical
Publication of JPH0520457Y2publicationCriticalpatent/JPH0520457Y2/ja
