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Priority to JP9026279UpriorityCriticalpatent/JPS568393U/ja
Priority to GB8021352Aprioritypatent/GB2055015B/en
Priority to US06/164,129prioritypatent/US4322584A/en
Priority to DE3024729Aprioritypatent/DE3024729C2/de
Publication of JPS568393UpublicationCriticalpatent/JPS568393U/ja