| 49 / | HD | MOVABLE OR REMOVABLE CLOSURES |
| 208 | DF | MOUNTED FOR MULTIDIRECTIONAL OR OBLIQUE MOVEMENT {7} |
| 226 | DF | .~ In plane of closure; e.g., oblique {4} |
| 228 | DF | .~.~ Gravitates on tilted track {2} |
| 229 | DF | .~.~.~ Oscillating track {1} |
| 230 | | .~.~.~.~ Sectional or nonlinear |