| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL |
| 47 | DF | CONTROL OF STORAGE OR RETRIEVAL BY A SIGNAL TO BE RECORDED OR REPRODUCED (E.G., PILOT OR CONTROL SIGNAL) {2} |
| 48 | DF | .~ Control of information signal channel {1} |
| 49 | ![]() | .~.~ Of plural interrelated channels |