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Priority claimed from GB868607687Aexternal-prioritypatent/GB8607687D0/en
Priority claimed from GB868612285Aexternal-prioritypatent/GB8612285D0/en
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Priority claimed from EP87302198Aexternal-prioritypatent/EP0239301B1/en
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Publication of ATE88984T1publicationCriticalpatent/ATE88984T1/en