| Section
| Date
| Issue
| Size
| Title
|
| 664-000-000 | 1972-08-01 | 13 | 133.15 KB | Numerical Index - Division 664 - Testboards for Other Than Special Services |
| 664-000-000 | 1983-09-01 | 22 | 137.04 KB | Numerical Index - Division 664 - Testboards for Other Than Special Services |
| 664-600-100 | 1940-03-01 | 1 | 2.37 MB | 18B Testboard - Description and Operating Principles |
| 664-600-500 | 1953-01-01 | 2 | 2.85 MB | 18B Testboard Lower Unit - Operation and Testing Methods in No. 3 or No. 11 (Sleeve Supervision) Switchboard Offices |
| 664-600-501 | 1953-02-01 | 1 | 1.97 MB | 18B Testboard Lower Unit - Testing Methods in Nos. 1 and 2 Switchboard Offices and Nos. 1D, 9C, 9D, 10, 11 (Bridged Supervision) and 12 Offices |
| 664-600-502 | 1953-07-01 | 1 | 2.17 MB | 18B Testboard Lower Unit - Testing Methods for Message Trunks in Decentralized DSA Switchboards or Crossbar Tandem Offices |
| 664-600-503 | 1955-02-01 | 1 | 841.33 KB | 18B Testboard Lower Unit - Testing Methods for Message Trunks Serving Connecting Company Offices |
| 664-600-504 | 1957-09-01 | 2 | 1.05 MB | Cord and Key Pulsing Circuits - Continuity and Operation Tests Using Test Circuit SD-63971-01 or SD-55056-01 - 18B Testboard |
| 664-710-100 | 1967-08-01 | 1 | 10.71 MB | Tandem Patching Bay for Spare Equipments and Patching Trunks for 4-Wire and 6-Wire VF Circuits |