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Priority to JP1979113215UpriorityCriticalpatent/JPS5752449Y2/ja
Priority to US06/177,376prioritypatent/US4344561A/en
Publication of JPS5644248UpublicationCriticalpatent/JPS5644248U/ja
Application grantedgrantedCritical
Publication of JPS5752449Y2publicationCriticalpatent/JPS5752449Y2/ja