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Priority to JP1986187266UpriorityCriticalpatent/JPH0431504Y2/ja
Publication of JPS6392168UpublicationCriticalpatent/JPS6392168U/ja
Priority to US07/388,759prioritypatent/US4917684A/en
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Publication of JPH0431504Y2publicationCriticalpatent/JPH0431504Y2/ja
