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Priority to JP14468187UpriorityCriticalpatent/JPH0726580Y2/ja
Priority to US07/247,468prioritypatent/US4961486A/en
Publication of JPS6449738UpublicationCriticalpatent/JPS6449738U/ja
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Publication of JPH0726580Y2publicationCriticalpatent/JPH0726580Y2/ja