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Priority claimed from JP14494979Aexternal-prioritypatent/JPS5669318A/ja
Priority claimed from JP16226179Uexternal-prioritypatent/JPS5925879Y2/ja
Priority claimed from JP15314679Aexternal-prioritypatent/JPS601922B2/ja
Priority claimed from JP16941279Aexternal-prioritypatent/JPS5693816A/ja
Application filed by Nippon Steel CorpfiledCriticalNippon Steel Corp
Priority claimed from EP80106936Aexternal-prioritypatent/EP0032173B2/de
Application grantedgrantedCritical
Publication of ATE12259T1publicationCriticalpatent/ATE12259T1/de