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for AT & T Information Systems (Firm)
Biography"AT&T Inc. is an American multinational conglomerate holding company that is Delaware-registered[6] but headquartered at Whitacre Tower in Downtown Dallas, Texas.[7] It is the world's largest telecommunications company, it is also the largest[8] provider of mobile telephone services in the U.S. As of 2020, AT&T was ranked 9th on the Fortune 500 rankings of the largest United States corporations, with revenues of $181 billion.[9]"--Wikipedia, 2021
