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Priority to JP1987104487UpriorityCriticalpatent/JPH0743825Y2/ja
Priority to US07/215,833prioritypatent/US4899242A/en
Publication of JPS6412270UpublicationCriticalpatent/JPS6412270U/ja
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Publication of JPH0743825Y2publicationCriticalpatent/JPH0743825Y2/ja