Bell System - How Old Today?

1

AT&T

1

Ameritech

1

Pacific_Telesis

4

AT&T_Bell_Laboratories

4

BellSouth

4

Bell_Labs

4

Bell_Operating_Company

4

Illinois_Bell

4

Indiana_Bell

4

Michigan_Bell

4

Ohio_Bell

4

Pacific_Bell

4

SBC_Communications

4

SBC_Communications_Inc.

4

Southwestern_Bell

4

Western_Electric

4

Wisconsin_Bell