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Priority to JP48016733ApriorityCriticalpatent/JPS521663B2/ja
Priority to GB476074Aprioritypatent/GB1418433A/en
Priority to DE19742405250prioritypatent/DE2405250C3/de
Publication of JPS49106830ApublicationCriticalpatent/JPS49106830A/ja
Publication of JPS521663B2publicationCriticalpatent/JPS521663B2/ja