| 297 / | HD | CHAIRS AND SEATS |
| 423.1 | DF | REST FOR KNEE, LEG, OR FOOT {6} |
| 423.19 | DF | .~ Connected to chair or seat for relative movement {5} |
| 423.2 | ![]() | .~.~ Horizontally slidable from beneath bottom to a position in front of bottom {2} |
| 423.21 | DF | .~.~.~> Having a floor-engaging support |
| 423.22 | DF | .~.~.~> Having additional movement to an operative position {1} |