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Publication date
Priority claimed from GB909006429Aexternal-prioritypatent/GB9006429D0/en
Priority claimed from GB909017397Aexternal-prioritypatent/GB9017397D0/en
Priority claimed from PCT/GB1991/000394external-prioritypatent/WO1991014834A1/en
Application filed by British TelecommfiledCriticalBritish Telecomm
Publication of NO923662D0publicationCriticalpatent/NO923662D0/no
Publication of NO923662LpublicationCriticalpatent/NO923662L/no