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Priority to JP1985061383UpriorityCriticalpatent/JPH0441389Y2/ja
Priority to US06/856,042prioritypatent/US4860128A/en
Publication of JPS61176646UpublicationCriticalpatent/JPS61176646U/ja
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Publication of JPH0441389Y2publicationCriticalpatent/JPH0441389Y2/ja