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Priority to JP1987156136UpriorityCriticalpatent/JPH0642170Y2/ja
Priority to US07/224,900prioritypatent/US4891997A/en
Publication of JPH0161611UpublicationCriticalpatent/JPH0161611U/ja
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Publication of JPH0642170Y2publicationCriticalpatent/JPH0642170Y2/ja