| 198 / | HD | CONVEYORS: POWER-DRIVEN |
| 523 | DF | CONVEYOR SYSTEM HAVING A GRAVITY CONVEYOR SECTION {11} |
| 560 | DF | .~ Power-driven conveyor section feeding to gravity section (i.e., gravity discharge material holder, or gravity flow path) feeding in turn to another power-driven section {1} |
| 561 | ![]() | .~.~ Gravity conveyor section fed by one run of power-driven section, and feeding in turn to another run of the same section |