| 209 / | HD | CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS |
| 233 | DF | SIFTING {16} |
| * | DD | .~ Drum sifters {2} |
| * | DD | .~.~ Horizontal and inclined {4} |
| 288 | DF | .~.~.~ Rotating {3} |
| 289 | DF | .~.~.~.~ Multiple {2} |
| 290 | | .~.~.~.~.~ Concentric {1} |
| 291 | DF | .~.~.~.~.~.~> Nested |