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Priority claimed from GB838325552Aexternal-prioritypatent/GB8325552D0/en
Priority claimed from GB838331299Aexternal-prioritypatent/GB8331299D0/en
Application filed by Plessey TelecommfiledCriticalPlessey Telecomm
Priority claimed from EP84306209Aexternal-prioritypatent/EP0139461B1/de
Application grantedgrantedCritical
Publication of ATE64673T1publicationCriticalpatent/ATE64673T1/de