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Priority to JP1987119630UpriorityCriticalpatent/JPH0724060Y2/ja
Priority to US07/225,370prioritypatent/US4899952A/en
Publication of JPS6424967UpublicationCriticalpatent/JPS6424967U/ja
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Publication of JPH0724060Y2publicationCriticalpatent/JPH0724060Y2/ja