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Priority to JP1972039442UpriorityCriticalpatent/JPS568618Y2/ja
Priority to US00344923Aprioritypatent/US3800720A/en
Publication of JPS491158UpublicationCriticalpatent/JPS491158U/ja
Application grantedgrantedCritical
Publication of JPS568618Y2publicationCriticalpatent/JPS568618Y2/ja