#17
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AT&T

AT&T Inc. is an American multinational telecommunications corporation, headquartered at Whitacre Tower in downtown Dallas, Texas. AT&T is the largest provider both of mobile telephony and of fixed telephony in the United States, and also provides broadband subscription television services. AT&T is the third-largest company in Texas. As of May 2013, AT&T is the 21st largest company in the world by market value, and the 13th largest non-oil company. As of 2013, ...

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