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Priority to JP1979084303UpriorityCriticalpatent/JPS6143973Y2/ja
Priority to US06/158,460prioritypatent/US4365746A/en
Publication of JPS562060UpublicationCriticalpatent/JPS562060U/ja
Application grantedgrantedCritical
Publication of JPS6143973Y2publicationCriticalpatent/JPS6143973Y2/ja