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Priority to JP10307386UpriorityCriticalpatent/JPH0239462Y2/ja
Priority to US07/021,369prioritypatent/US4780253A/en
Publication of JPS638039UpublicationCriticalpatent/JPS638039U/ja
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Publication of JPH0239462Y2publicationCriticalpatent/JPH0239462Y2/ja