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Priority to JP1981134518UpriorityCriticalpatent/JPS5839393U/ja
Priority to US06/411,534prioritypatent/US4475616A/en
Publication of JPS5839393UpublicationCriticalpatent/JPS5839393U/ja
Application grantedgrantedCritical
Publication of JPS626952Y2publicationCriticalpatent/JPS626952Y2/ja