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AT&T Corporation, originally the American Telephone and Telegraph Company, is the subsidiary of AT&T Inc. that provides voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agencies.

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Footnotes / references. [4] AT&T Inc. (originally the American Telephone and Telegraph Company) is an American multinational telecommunications holding company that is Delaware-registered [5] but headquartered at Whitacre Tower in Downtown Dallas, Texas. [6] It is the world's largest telecommunications company and the largest [7] provider of ...

On Jan. 31, 2005, SBC Communications Inc. ("SBC") announced its historic agreement to acquire AT&T Corp. After the closing of the acquisition, AT&T Corp. became a wholly owned subsidiary of SBC. In recognition of the global importance of the AT&T name, SBC changed its corporate name to AT&T Inc. The acquisition was completed on Nov. 18, 2005.

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