| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL | 
| 176 | DF | DYNAMIC MECHANISM SUBSYSTEM {8} | 
| 244 | DF | .~ Specific detail of transducer assembly support structure (e.g., tone arm) {8} | 
| 247 |  | .~.~ Vibration or resonance suppression (e.g., damping) {1} | 
| 248 | DF | .~.~.~> By viscous damping |