| 434 / | HD | EDUCATION AND DEMONSTRATION |
| 308 | DF | AUDIO RECORDING AND VISUAL MEANS {4} |
| 309 | DF | .~ Common carrier for visual means and audio recording {2} |
| 311 | DF | .~.~ Card, sheet, or block {1} |
| 312 | DF | .~.~.~ Reading head moved past stationary audio track {1} |
| 313 | | .~.~.~.~ Manually |