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Priority claimed from GB5212/76Aexternal-prioritypatent/GB1575507A/en
Application filed by Shell Int ResearchfiledCriticalShell Int Research
Publication of ATA161478ApublicationCriticalpatent/ATA161478A/en
Application grantedgrantedCritical
Publication of AT358817BpublicationCriticalpatent/AT358817B/en