| 400 / | HD | TYPEWRITING MACHINES |
| 118.2 | DF | TYPING BY OTHER THAN TYPE-FACE OR TYPE-DIE {3} |
| 124.01 | DF | .~ Character formation by impact (e.g., wire matrix) {4} |
| 124.11 | DF | .~.~ Printhead {6} |
| 124.29 | ![]() | .~.~.~ Impact member structure {3} |
| 124.3 | DF | .~.~.~.~> Tip cross-section |
| 124.31 | DF | .~.~.~.~> With attachment or engagement means |
| 124.32 | DF | .~.~.~.~> Specific material |