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Priority to JP11403880UpriorityCriticalpatent/JPS609763Y2/ja
Priority to US06/289,177prioritypatent/US4458990A/en
Publication of JPS5739012UpublicationCriticalpatent/JPS5739012U/ja
Application grantedgrantedCritical
Publication of JPS609763Y2publicationCriticalpatent/JPS609763Y2/ja