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Priority claimed from GB878703761Aexternal-prioritypatent/GB8703761D0/en
Priority claimed from GB878720542Aexternal-prioritypatent/GB8720542D0/en
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Priority claimed from EP88200283Aexternal-prioritypatent/EP0279499B2/de
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Publication of ATE69928T1publicationCriticalpatent/ATE69928T1/de