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Priority to JP9925278UpriorityCriticalpatent/JPS5516912U/ja
Priority to GB7834795Aprioritypatent/GB2006898B/en
Priority to US05/938,311prioritypatent/US4220217A/en
Priority to DE2839244Aprioritypatent/DE2839244C2/de
Publication of JPS5516912UpublicationCriticalpatent/JPS5516912U/ja