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Priority claimed from US06/814,705external-prioritypatent/US4622352A/en
Priority claimed from US06/814,706external-prioritypatent/US4622350A/en
Application filed by Shell Int ResearchfiledCriticalShell Int Research
Priority claimed from EP86202048Aexternal-prioritypatent/EP0227139B1/en
Application grantedgrantedCritical
Publication of ATE89585T1publicationCriticalpatent/ATE89585T1/en