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Priority claimed from JP62322321Aexternal-prioritypatent/JP2600732B2/en
Priority claimed from JP32232887Aexternal-prioritypatent/JP2600229B2/en
Priority claimed from JP62322322Aexternal-prioritypatent/JP2600733B2/en
Application filed by Nippon Kokan KkfiledCriticalNippon Kokan Kk
Priority claimed from EP88121236Aexternal-prioritypatent/EP0320999B1/en
Application grantedgrantedCritical
Publication of ATE103638T1publicationCriticalpatent/ATE103638T1/en