| 400 / | HD | TYPEWRITING MACHINES |
| 251 | DF | CASE-SHIFT MECHANISM {14} |
| 274 | DF | .~ For locking case-shift mechanism in position (e.g., rebound lock, cam, etc.) {2} |
| 276 | DF | .~.~ For locking shift-key lever in depressed position {2} |
| 276.1 | ![]() | .~.~.~ By toggle-linkage |