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Priority claimed from JP17976386Aexternal-prioritypatent/JPS6334466A/en
Priority claimed from EP89202415Aexternal-prioritypatent/EP0360362B1/en
Application filed by Showa Aluminium Co LtdfiledCriticalShowa Aluminium Co Ltd
Application grantedgrantedCritical
Publication of ATE78579T1publicationCriticalpatent/ATE78579T1/en