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Priority claimed from GB858515583Aexternal-prioritypatent/GB8515583D0/en
Priority claimed from GB858515500Aexternal-prioritypatent/GB8515500D0/en
Application filed by British TelecommfiledCriticalBritish Telecomm
Priority claimed from PCT/GB1986/000353external-prioritypatent/WO1986007657A1/en
Application grantedgrantedCritical
Publication of ATE56845T1publicationCriticalpatent/ATE56845T1/de