These are historical Bell System Practices from the 1960s and earlier.
| Division | Description |
|---|---|
| Division 950 | General Descriptive Information |
| Division A | Central Office Maintenance |
| Division AA | Equipment Engineering |
| Division AB | Transmission Engineering and Data |
| Division AG | Outside Plant Engineering |
| Division B | Private Branch Exchange Installation and Maintenance |
| Division C10 | Station Installation and Maintenance - General / Components |
| Division C20 | Station Installation and Maintenance - Wiring |
| Division C30 | Station Installation and Maintenance - Apparatus - Dial and Manual Stations |
| Division C40 | Station Installation and Maintenance - Connections - Dial and Manual Stations |
| Division C50 | Station Installation and Maintenance - Other Apparatus and Connections |
| Division C60 | Station Installation and Maintenance - Inspection, Testing and General Trouble Locating Methods |
| Division C70 | Station Installation and Maintenance - Minor and Major Station Systems (Key Systems) / Tools, Gauges, and Test Sets Methods |
| Division C80 | Station Installation and Maintenance - Government Systems |
| Division C85 | Station Installation and Maintenance - Common Systems |
| Division D | Recovery and Repair |
| Division E | Toll Test Room Operation |
| Division F | Local Test Room Operation |
| Division G00 | Outside Plant Contruction and Maintenance - Index and Plan |
| Division G10 | Outside Plant Construction and Maintenance - General |
| Division G20 | Outside Plant Construction and Maintenance - Pole Lines |
| Division G30 | Outside Plant Construction and Maintenance - Wire |
| Division G40 | Outside Plant Construction and Maintenance - Conduit |
| Division G50 | Outside Plant Construction and Maintenance - Cable |
| Division G60 | Outside Plant Construction and Maintenance - Terminals |
| Division G70 | Outside Plant Construction and Maintenance - Splicing and Testing |
| Division G80 | Outside Plant Construction and Maintenance - Tools |
| Division G90 | Outside Plant Construction and Maintenance - Motor Vehicles and Construction Apparatus |
| Division H10 | Buildings - General |
| Division H20 | Buildings - Planning |
| Division H30 | Buildings - Construction and Mechanical Plant |
| Division H40 | Buildings - Fire Protection |
| Division H50 | Buildings - Operation and Maintenance |
| Division J | Motor Vehicles and Construction Apparatus |
| Division K | Transmission Testing |
| Division M | Plant Assignment |
| Division P | Teletypewriter and Data Stations |
| Division R | Radio Systems |
