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Priority to JP7956877UpriorityCriticalpatent/JPS546973U/ja
Priority to GB7826305Aprioritypatent/GB2000339B/en
Priority to US05/912,535prioritypatent/US4293940A/en
Priority to DE2826073Aprioritypatent/DE2826073C3/de
Publication of JPS546973UpublicationCriticalpatent/JPS546973U/ja