| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL |
| 43 | DF | WITH SERVO POSITIONING OF TRANSDUCER ASSEMBLY OVER TRACK COMBINED WITH INFORMATION SIGNAL PROCESSING {1} |
| 44.11 | DF | .~ Optical servo system {12} |
| 44.35 | DF | .~.~ Servo loop gain/switching control {1} |
| 44.36 | ![]() | .~.~.~ Variable gain |