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Priority claimed from GB868624071Aexternal-prioritypatent/GB8624071D0/en
Priority claimed from GB878701174Aexternal-prioritypatent/GB8701174D0/en
Application filed by British TelecommfiledCriticalBritish Telecomm
Priority claimed from EP87308894Aexternal-prioritypatent/EP0265120B1/de
Application grantedgrantedCritical
Publication of ATE93328T1publicationCriticalpatent/ATE93328T1/de