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Priority claimed from JP4616279Aexternal-prioritypatent/JPS55138015A/ja
Priority claimed from JP10000979Aexternal-prioritypatent/JPS5625916A/ja
Application filed by Nippon Steel CorpfiledCriticalNippon Steel Corp
Priority claimed from EP80102025Aexternal-prioritypatent/EP0017963B1/de
Application grantedgrantedCritical
Publication of ATE21120T1publicationCriticalpatent/ATE21120T1/de