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 IN874/CAL/87Aexternal-prioritypatent/IN169085B/en
Application filed by American Telephone & TelegraphfiledCriticalAmerican Telephone & Telegraph
Priority to IN78CA1991priorityCriticalpatent/IN173346B/en
Publication of IN173346BpublicationCriticalpatent/IN173346B/en