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Priority to JP16139979UpriorityCriticalpatent/JPS6128216Y2/ja
Priority to US06/137,493prioritypatent/US4321587A/en
Priority to DE8080301138Tprioritypatent/DE3068770D1/de
Priority to EP80301138Aprioritypatent/EP0029635B1/en
Publication of JPS5677870UpublicationCriticalpatent/JPS5677870U/ja
Application grantedgrantedCritical
Publication of JPS6128216Y2publicationCriticalpatent/JPS6128216Y2/ja