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Priority claimed from GB878715192Aexternal-prioritypatent/GB8715192D0/en
Priority claimed from GB888804172Aexternal-prioritypatent/GB8804172D0/en
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Priority claimed from EP88304534Aexternal-prioritypatent/EP0297710B1/de
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Publication of ATE82997T1publicationCriticalpatent/ATE82997T1/de