At the time of the breakup of the Bell System in the early 1980s, it had assets of $150 billion (equivalent to $370 billion in 2020) and employed over one million people. … Bell System. IndustryTelecommunicationsHeadquartersDallas, Texas , U.S.ParentBell Telephone Company (1877–1885) AT&T (1885–1982)Bell System – Wikipedia en.wikipedia.org › wiki › Bell_System