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Priority to JP1980170558UpriorityCriticalpatent/JPS631271Y2/ja
Priority to US06/235,383prioritypatent/US4453833A/en
Priority to GB8105284Aprioritypatent/GB2071365B/en
Publication of JPS5793888UpublicationCriticalpatent/JPS5793888U/ja
Application grantedgrantedCritical
Publication of JPS631271Y2publicationCriticalpatent/JPS631271Y2/ja