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Priority to JP516973ApriorityCriticalpatent/JPS52743B2/ja
Priority to DE19732324400prioritypatent/DE2324400C3/de
Priority to IT6841773Aprioritypatent/IT986336B/it
Publication of JPS4993246ApublicationCriticalpatent/JPS4993246A/ja
Publication of JPS52743B2publicationCriticalpatent/JPS52743B2/ja