| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL | 
| 93 | DF | SYSTEMS HAVING PLURAL PHYSICALLY DISTINCT INDEPENDENT TRACKS ON A SINGLE STORAGE MEDIUM SURFACE {4} | 
| 96 |  | .~ Continuous consecutive storage or retrieval of interrupted track for single signal (e.g., automatic reversal) {1} | 
| 97 | DF | .~.~> Tracks transverse to a motion component |