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Priority to JP1989072179UpriorityCriticalpatent/JPH0612737Y2/ja
Publication of JPH0313110UpublicationCriticalpatent/JPH0313110U/ja
Priority to US07/811,881prioritypatent/US5255669A/en
Application grantedgrantedCritical
Publication of JPH0612737Y2publicationCriticalpatent/JPH0612737Y2/ja