| Section | Date | Issue | Size | Title |
| 852-220-100 | 1952-05-01 | 1 | 3.01 MB | 500 Series Combined Telephone Sets - General Description |
| 852-220-101 | 1952-05-01 | 1 | 2.25 MB | 500 Series Combined Telephone Sets - Transmission Performance - A, B, J, and K Series |
| 852-220-102 | 1956-10-01 | 2 | 5.20 MB | 500 Series Combined Telephone Sets - Transmission Performance - C and D Series |