| 198 / | HD | CONVEYORS: POWER-DRIVEN |
| 570 | DF | CONVEYING SYSTEM HAVING PLURAL POWER-DRIVEN CONVEYING SECTIONS {18} |
| 602 | DF | .~ Forming a single conveying path {6} |
| 606 | DF | .~.~ Plural sections each formed of or including a closed flexible loop {1} |
| 607 | | .~.~.~ With elevating or lowering section |