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 CA002017459Aexternal-prioritypatent/CA2017459C/en
Application filed by At & T CorpfiledCriticalAt & T Corp
Publication of IN179670BpublicationCriticalpatent/IN179670B/en