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Regional Bell operating company

The Regional Bell operating companies (RBOC) are the result of the United States antitrust action against AT&T in 1983. After the Modification of Final Judgment, the resulting Baby Bells were originally:

These companies have since merged, leaving only 4 regional telephone companies in the United States. After the 1984 breakup, part of AT&T's Bell Labs was split off into Bellcore, which would serve as an R&D and standards body for the seven Baby Bells.

See also : Competitive local exchange carriers (CLECs), Bellcore

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