에이티앤티(AT&T) - HD

Divisions


AT&T, prior to its merger with SBC Communications, had three core companies:
- AT&T Alascom


- AT&T Communications


- AT&T Laboratories

AT&T Alascom continues to sell service in Alaska, while AT&T Communications continues to sell long distance telephone service and operate as a CLEC outside of the borders of the Bell Operating Companies that AT&T owns. AT&T Laboratories has been integrated into AT&T Labs, formerly named SBC Laboratories.
From http://en.wikipedia.org/wiki/American_Telephone_and_Telegraph