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Priority to JP50051656ApriorityCriticalpatent/JPS51127161A/ja
Priority to DE2557718Aprioritypatent/DE2557718C3/de
Priority to GB52638/75Aprioritypatent/GB1538441A/en
Publication of JPS51127161ApublicationCriticalpatent/JPS51127161A/ja
Publication of JPS5334156B2publicationCriticalpatent/JPS5334156B2/ja