Definitions for "Ameritech"
One of the seven Regional Bell Holding Companies (RBHCs) resulting from divestiture, covering the midwestern U.S., based in Chicago, and comprised of Illinois Bell, Indiana Bell, Michigan Bell, Ohio Bell, and Wisconsin Tel.
Ameritech (American Information Technologies) was a U.S. telecommunications company that arose out of the 1984 AT&T divestiture. Ameritech was one of seven RBOCs, or Regional Bell Operating Companies divested.
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