198 / | HD | CONVEYORS: POWER-DRIVEN |
523 | DF | CONVEYOR SYSTEM HAVING A GRAVITY CONVEYOR SECTION {11} |
562 | DF | .~ Gravity conveyor section is gravity flow path feeding to power-driven section {4} |
566 | DF | .~.~ Plural power-driven sections {1} |
567 | .~.~.~ Serially arranged |