| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL | 
| 176 | DF | DYNAMIC MECHANISM SUBSYSTEM {8} | 
| 215 | DF | .~ Having power driven transducer assembly {6} | 
| 225 | DF | .~.~ Restoring after passive tracking {2} | 
| 226 | DF | .~.~.~ Responsive to transducer support condition (e.g., movement or position) {2} | 
| 228 |  | .~.~.~.~ Controllable position |