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} |
113 | DF | .~.~ With medium contacting drum or gate in optical system (e.g., sound head) {2} |
115 | .~.~.~ With driving or stabilizing mechanism |