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Priority claimed from GB878729152Aexternal-prioritypatent/GB8729152D0/en
Priority claimed from GB8809328Aexternal-prioritypatent/GB2217174A/en
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Priority claimed from EP19880202873external-prioritypatent/EP0322952B1/en
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Publication of ATE72936T1publicationCriticalpatent/ATE72936T1/en