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Priority to JP16897682UpriorityCriticalpatent/JPS5973523U/ja
Priority to US06/548,098prioritypatent/US4519343A/en
Publication of JPS5973523UpublicationCriticalpatent/JPS5973523U/ja
Application grantedgrantedCritical
Publication of JPS643774Y2publicationCriticalpatent/JPS643774Y2/ja