The Regional Bell Operating Companies (RBOCs)

US WEST

Mountain Bell

Northwestern Bell

Pacific Northwestern Bell

PACIFIC TELESIS*

Pacific Bell

Nevada Bell

SOUTHWEST BELL*

CORPORATION

Southwestern Bell

AMERITECH

Michigan Bell

Ohio Bell

Wisconsin Bell

NYNEX

New England Telephone

New York Telephone

BELLSOUTH

South Central Bell

Southern Bell

BELL ATLANTIC

Bell of Pensilvania

Diamond State Telephone

Chesapeake and Potomac Companies

New Jersey Bell

*SBC Communications Inc. of San Antonio, Texas, is the holding company for Southwestern Bell, Pacific Bell, Nevada Bell, and Cellular One. SBC Communications Inc. acquired Pacific Telisis Group April 1, 1997.

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