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Priority to JP12000977UpriorityCriticalpatent/JPS5447717U/ja
Priority to US05/940,137prioritypatent/US4206944A/en
Priority to DE19782839048prioritypatent/DE2839048A1/de
Priority to GB7835878Aprioritypatent/GB2003971B/en
Publication of JPS5447717UpublicationCriticalpatent/JPS5447717U/ja