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Priority to JP1989070424UpriorityCriticalpatent/JPH0752043Y2/ja
Publication of JPH0311655UpublicationCriticalpatent/JPH0311655U/ja
Priority to US08/107,164prioritypatent/US5361920A/en
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Publication of JPH0752043Y2publicationCriticalpatent/JPH0752043Y2/ja