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Priority to JP1988063045UpriorityCriticalpatent/JPH084869Y2/ja
Priority to US07/247,433prioritypatent/US4923140A/en
Publication of JPH01167866UpublicationCriticalpatent/JPH01167866U/ja
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Publication of JPH084869Y2publicationCriticalpatent/JPH084869Y2/ja