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Priority claimed from FR8027270Aexternal-prioritypatent/FR2496670B1/fr
Application filed by Charbonnages Ste ChimiquefiledCriticalCharbonnages Ste Chimique
Publication of CS270784A2publicationCriticalpatent/CS270784A2/cs
Publication of CS244687B2publicationCriticalpatent/CS244687B2/cs