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Priority claimed from JP4227889Aexternal-prioritypatent/JPH07100811B2/en
Priority claimed from JP4227789Aexternal-prioritypatent/JPH07100810B2/en
Priority claimed from JP1098152Aexternal-prioritypatent/JPH02274804A/en
Priority claimed from JP1108897Aexternal-prioritypatent/JPH02285017A/en
Application filed by Nippon Kokan KkfiledCriticalNippon Kokan Kk
Priority claimed from EP90103242Aexternal-prioritypatent/EP0384397B1/en
Application grantedgrantedCritical
Publication of ATE94215T1publicationCriticalpatent/ATE94215T1/en