| 297 / | HD | CHAIRS AND SEATS |
| 258.1 | DF | ROCKER-MOUNTED {7} |
| 261.1 | DF | .~ Track-mounted rocker (e.g., platform rocker) {6} |
| 264.1 | DF | .~.~ Spring return to neutral position {3} |
| 265.1 | DF | .~.~.~ Coil spring {1} |
| 266.1 | | .~.~.~.~ Extensible {1} |
| 267.1 | DF | .~.~.~.~.~> With opposing compressible coil spring |