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Priority to JP1987117702UpriorityCriticalpatent/JPH0649849Y2/ja
Publication of JPS6422824UpublicationCriticalpatent/JPS6422824U/ja
Priority to US07/492,373prioritypatent/US5074254A/en
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Publication of JPH0649849Y2publicationCriticalpatent/JPH0649849Y2/ja