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Priority claimed from FR8407189Aexternal-prioritypatent/FR2564089B1/fr
Priority claimed from FR8503671Aexternal-prioritypatent/FR2578837A1/fr
Application filed by Charbonnages Ste ChimiquefiledCriticalCharbonnages Ste Chimique
Priority claimed from EP85400817Aexternal-prioritypatent/EP0161979B1/de
Application grantedgrantedCritical
Publication of ATE24885T1publicationCriticalpatent/ATE24885T1/de