AT&T

Background
The original AT&T Corporation was founded in March 3, 1885 by Alexander Graham Bell, Gardiner Greene Hubbard and Thomas Sanders, initially as one of the subsidiaries of the American Bell Telephone Company. It soon became the new parent company after acquiring the latter company's assets on December 30, 1899. Since then, the company (along with its subsidiaries) had held a monopoly called the Bell System, which was split up by 1983.

1st Logo (2001-2002)
Logo: Unknown

Variant: Unknown

Technique: CGI.

Audio: Unknown

2nd Logo (2005-2006)
Logo: Unknown

Variant: Unknown

Technique: CGI.

Audio: Unknown

Copyright stamps

 * 1968: Copyright © by American Telephone and Telegraph Company
 * 1982-1991: Copyright © by AT&T