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Priority to JP15270078UpriorityCriticalpatent/JPS5917717Y2/ja
Priority to US06/037,290prioritypatent/US4261531A/en
Publication of JPS5570347UpublicationCriticalpatent/JPS5570347U/ja
Application grantedgrantedCritical
Publication of JPS5917717Y2publicationCriticalpatent/JPS5917717Y2/ja