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
Application filed by British TelecommfiledCriticalBritish Telecomm
Priority to IN396MA1991priorityCriticalpatent/IN172578B/en
Publication of IN170322BpublicationCriticalpatent/IN170322B/en