| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL |
| 99 | DF | SPECIFIC DETAIL OF INFORMATION HANDLING PORTION OF SYSTEM {4} |
| 100 | DF | .~ Radiation beam modification of or by storage medium {20} |
| 121 | DF | .~.~ With particular light source (e.g., laser, CRT with phosphor) {2} |
| 123 | | .~.~.~ Glow lamps |