| 209 / | HD | CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS |
| 3 | DF | PRECEDENT PREPARATION OF ITEMS OR MATERIALS TO FACILITATE SEPARATION {2} |
| 3.1 | | .~ Sorting special items or sorting by methods and apparatus includible in subclasses 509 through 707 {2} |
| 3.2 | DF | .~.~> Condition responsive sensor controlling preparation |
| 3.3 | DF | .~.~> Marking or tagging item |