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Priority to JP11309579UpriorityCriticalpatent/JPS5630440U/ja
Priority to GB8023521Aprioritypatent/GB2060927B/en
Priority to US06/171,071prioritypatent/US4367543A/en
Priority to DE3027950Aprioritypatent/DE3027950C2/de
Publication of JPS5630440UpublicationCriticalpatent/JPS5630440U/ja