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Priority to JP1987127882UpriorityCriticalpatent/JPH0516584Y2/ja
Priority to US07/180,451prioritypatent/US4957356A/en
Publication of JPS6432532UpublicationCriticalpatent/JPS6432532U/ja
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Publication of JPH0516584Y2publicationCriticalpatent/JPH0516584Y2/ja