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Priority to JP1989003697UpriorityCriticalpatent/JPH0711923Y2/ja
Priority to US07/461,219prioritypatent/US4979306A/en
Publication of JPH02124102UpublicationCriticalpatent/JPH02124102U/ja
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Publication of JPH0711923Y2publicationCriticalpatent/JPH0711923Y2/ja