| 369 / | HD | DYNAMIC INFORMATION STORAGE OR RETRIEVAL |
| 99 | DF | SPECIFIC DETAIL OF INFORMATION HANDLING PORTION OF SYSTEM {4} |
| 127 | DF | .~ Mechanical modification or sensing of storage medium {6} |
| 135 | DF | .~.~ Specified structure of electrical transducing assembly {11} |
| 136 | ![]() | .~.~.~ Multichannel (stereo cartridge) {2} |
| 137 | DF | .~.~.~.~> By stress application to solid transducing element (e.g., piezoelectric) {1} |
| 139 | DF | .~.~.~.~> With details of damping or compliance |