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Priority to JP1987067931UpriorityCriticalpatent/JP2529161Y2/ja
Publication of JPS63176641UpublicationCriticalpatent/JPS63176641U/ja
Priority to US07/474,626prioritypatent/US5024541A/en
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Publication of JP2529161Y2publicationCriticalpatent/JP2529161Y2/ja
