AT&T
Bell_Labs
Cingular_Wireless
BellSouth
Bell_Canada
AT&T_Corporation
Bell_System
Southwestern_Bell
Bell_MTS
US_West
NYNEX
Pacific_Bell
Pacific_Telesis
South_Central_Bell
C&P_Telephone
Pacific_Northwest_Bell
Wisconsin_Bell
Indiana_Bell
Nevada_Bell
Northwestern_Bell
BellSouth_Telecommunications
Verizon_New_England
Diamond_State_Telephone
Illinois_Bell