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Priority to JP1979147420UpriorityCriticalpatent/JPS5931883Y2/ja
Publication of JPS5665070UpublicationCriticalpatent/JPS5665070U/ja
Priority to US06/574,019prioritypatent/US4505007A/en
Application grantedgrantedCritical
Publication of JPS5931883Y2publicationCriticalpatent/JPS5931883Y2/ja