Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB858502924Aexternal-prioritypatent/GB8502924D0/en
Application filed by British TelecommfiledCriticalBritish Telecomm
Application grantedgrantedCritical
Publication of ATE61900T1publicationCriticalpatent/ATE61900T1/de