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Priority claimed from GB858519422Aexternal-prioritypatent/GB8519422D0/en
Priority claimed from GB868602329Aexternal-prioritypatent/GB8602329D0/en
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Priority claimed from EP86305465Aexternal-prioritypatent/EP0211545B1/en
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Publication of ATE52077T1publicationCriticalpatent/ATE52077T1/en