Template:Bell System
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| Corporate Operations | |
|---|---|
| Holding Company: | American Telephone and Telegraph Company |
| Local Telephone Operations | |
| Bell Operating Companies: | Bell Telephone Company of Nevada | The Bell Telephone Company of Pennsylvania | The Chesapeake & Potomac Telephone Company | The Chesapeake & Potomac Telephone Company of Maryland | The Chesapeake & Potomac Telephone Company of West Virginia | The Chesapeake & Potomac Telephone Company of Virginia | Diamond State Telephone | Illinois Bell | Indiana Bell | Michigan Bell | Mountain Bell | New England Telephone & Telegraph | New Jersey Bell | New York Telephone | Northwestern Bell | Ohio Bell | Pacific Northwest Bell | Pacific Telephone | South Central Bell | Southern Bell | Southwestern Bell | Wisconsin Telephone |
| Franchisees: | Southern New England Telephone | Cincinnati Bell |
| Other AT&T Subsidiaries | |
| Manufacturing: | Western Electric |
| R&D Operations: | Bell Labs |
| Long Distance Services: | AT&T Long Lines |
| Wireless Services: | Advanced Mobile Phone Service |
