| 209 / | HD | CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS |
| 12.1 | DF | PLURAL, DIVERSE SEPARATING OPERATIONS {17} |
| 44.1 | DF | .~ Including sorting of special items or sorting by methods or apparatus includible in subclasses 509 through 707 {3} |
| 44.3 | | .~.~ Drum-type sifter |