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Priority claimed from GB878715528Aexternal-prioritypatent/GB8715528D0/en
Priority claimed from GB888811058Aexternal-prioritypatent/GB8811058D0/en
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Priority claimed from EP19880305386external-prioritypatent/EP0300612B1/de
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Publication of ATE96456T1publicationCriticalpatent/ATE96456T1/de