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Priority to JP5186585UpriorityCriticalpatent/JPH0331940Y2/ja
Publication of JPS61167630UpublicationCriticalpatent/JPS61167630U/ja
Priority to US07/060,987prioritypatent/US4789875A/en
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Publication of JPH0331940Y2publicationCriticalpatent/JPH0331940Y2/ja