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Priority claimed from FR8308334Aexternal-prioritypatent/FR2546184B1/fr
Priority claimed from FR8403864Aexternal-prioritypatent/FR2560613B2/fr
Application filed by Pechiney AluminiumfiledCriticalPechiney Aluminium
Application grantedgrantedCritical
Publication of ATE30053T1publicationCriticalpatent/ATE30053T1/de