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Priority claimed from GB858512687Aexternal-prioritypatent/GB8512687D0/en
Priority claimed from GB858519224Aexternal-prioritypatent/GB8519224D0/en
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Priority claimed from EP85308355Aexternal-prioritypatent/EP0185465B1/en
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Publication of ATE40900T1publicationCriticalpatent/ATE40900T1/en