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Publication date
Priority claimed from GB858521970Aexternal-prioritypatent/GB8521970D0/en
Application filed by British Petroleum CofiledCriticalBritish Petroleum Co
Publication of NO871814D0publicationCriticalpatent/NO871814D0/en
Publication of NO871814LpublicationCriticalpatent/NO871814L/en
Publication of NO166205BpublicationCriticalpatent/NO166205B/en
Publication of NO166205CpublicationCriticalpatent/NO166205C/en