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Priority to JP15780276UpriorityCriticalpatent/JPS575585Y2/ja
Priority to US05/853,765prioritypatent/US4178752A/en
Publication of JPS5374256UpublicationCriticalpatent/JPS5374256U/ja
Application grantedgrantedCritical
Publication of JPS575585Y2publicationCriticalpatent/JPS575585Y2/ja