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Priority to JP1979127957UpriorityCriticalpatent/JPS639260Y2/ja
Priority to US06/183,636prioritypatent/US4380003A/en
Publication of JPS5644579UpublicationCriticalpatent/JPS5644579U/ja
Application grantedgrantedCritical
Publication of JPS639260Y2publicationCriticalpatent/JPS639260Y2/ja