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Priority to JP18226079UpriorityCriticalpatent/JPS5721751Y2/ja
Priority to US06/215,311prioritypatent/US4386865A/en
Publication of JPS5698490UpublicationCriticalpatent/JPS5698490U/ja
Application grantedgrantedCritical
Publication of JPS5721751Y2publicationCriticalpatent/JPS5721751Y2/ja