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Priority claimed from GB878700393Aexternal-prioritypatent/GB8700393D0/en
Priority claimed from GB878700394Aexternal-prioritypatent/GB8700394D0/en
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Priority claimed from EP19870311027external-prioritypatent/EP0276558B1/en
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Publication of ATE78018T1publicationCriticalpatent/ATE78018T1/en