AT&T
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AT&T Inc., an abbreviation of its predecessor's original name, the American Telephone and Telegraph Company, is an American multinational telecommunications company headquartered at the Whitacre Tower
Whitacre Tower, AT&T's corporate headquarters in Dallas
An AT&T retail store in Asheville, North Carolina
An AT&T office in San Antonio, Texas
Diagram of how alleged wiretapping worked, from EFF court filings
Bell System
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The Bell System was a system of telecommunication companies, led by the Bell Telephone Company and later by the American Telephone and Telegraph Company, that dominated the telephone services industry
1912 Bell System advertisement promoting its slogan for universal service
195 Broadway, AT&T headquarters for most of the 20th century
The Spirit of Communication as used on the Bell System's directories in the 1930s and 1940s
Manhole cover with Bell System logo