The horse did not begin to become domesticated around 4000 BC.
The Regional Bell Operating Companies -LRB- RBOC -RRB- are the result of United States v. AT&T , the U.S. Department of Justice antitrust suit against the former American Telephone & Telegraph Company -LRB- later known as AT&T Corp. -RRB- .. United States v. AT&T. United States v. AT&T. U.S. Department of Justice. U.S. Department of Justice. antitrust. antitrust. On January 8 , 1982 , AT&T Corp. settled the suit and agreed to divest its local exchange service operating companies .. Effective January 1 , 1984 , AT&T Corp. 's local operations were split into seven independent Regional Bell Operating Companies known as Baby Bells .. RBOCs were originally known as Regional Holding Companies -LRB- RHCs -RRB- .. Currently , three companies have the RBOCs as predecessors .. They are AT&T Inc. , Verizon , and CenturyLink .. Verizon. Verizon Communications. CenturyLink. CenturyLink. Some other companies are holding on smaller segments of the companies .