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Priority to JP1987099865UpriorityCriticalpatent/JPH0521620Y2/ja
Priority to US07/213,014prioritypatent/US4880078A/en
Publication of JPS644816UpublicationCriticalpatent/JPS644816U/ja
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Publication of JPH0521620Y2publicationCriticalpatent/JPH0521620Y2/ja