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Priority to JP1980170731UpriorityCriticalpatent/JPS6224457Y2/ja
Priority to US06/251,762prioritypatent/US4422259A/en
Priority to DE8181301772Tprioritypatent/DE3161933D1/de
Priority to EP81301772Aprioritypatent/EP0039198B1/en
Publication of JPS5791469UpublicationCriticalpatent/JPS5791469U/ja
Application grantedgrantedCritical
Publication of JPS6224457Y2publicationCriticalpatent/JPS6224457Y2/ja