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Priority claimed from FR7123793Aexternal-prioritypatent/FR2144069A5/fr
Publication of NO753472LpublicationCriticalpatent/NO753472L/no
Application filed by Charbonnages Ste ChimiquefiledCriticalCharbonnages Ste Chimique
Priority to NO753472ApriorityCriticalpatent/NO137751C/no
Publication of NO137751BpublicationCriticalpatent/NO137751B/no
Publication of NO137751CpublicationCriticalpatent/NO137751C/no