| 198 / | HD | CONVEYORS: POWER-DRIVEN |
| 523 | DF | CONVEYOR SYSTEM HAVING A GRAVITY CONVEYOR SECTION {11} |
| 525 | DF | .~ With means to affect flow {7} |
| 526 | DF | .~.~ Moving flow control means coordinated with power-driven conveyor section {1} |
| 527 | ![]() | .~.~.~ Successive power-driven conveyor sections |