| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL |
|
| 99 | DF | SPECIFIC DETAIL OF INFORMATION HANDLING PORTION OF SYSTEM {4} |
| 127 | DF | .~ Mechanical modification or sensing of storage medium {6} |
| 155 | DF | .~.~ Mechanical conversion to or from sound {4} |
| 160 |  | .~.~.~ Sound box {6} |
| 161 | DF | .~.~.~.~> With interchangeable styli |
| 162 | DF | .~.~.~.~> Including stylus pivoted from fixed casing |
| 163 | DF | .~.~.~.~> With sound modification |
| 164 | DF | .~.~.~.~> Convertible between lateral and perpendicular modulation modes |
| 165 | DF | .~.~.~.~> Perpendicular mechanical modulation {3} |
| 169 | DF | .~.~.~.~> Lateral mechanical modulation |