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Priority claimed from GB858521978Aexternal-prioritypatent/GB8521978D0/en
Priority claimed from GB868605033Aexternal-prioritypatent/GB8605033D0/en
Application filed by Shell Int ResearchfiledCriticalShell Int Research
Priority claimed from EP86201423Aexternal-prioritypatent/EP0216406B1/de
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Publication of ATE65826T1publicationCriticalpatent/ATE65826T1/de