198 / | HD | CONVEYORS: POWER-DRIVEN |
570 | DF | CONVEYING SYSTEM HAVING PLURAL POWER-DRIVEN CONVEYING SECTIONS {18} |
586 | DF | .~ With relatively adjustable sections {3} |
592 | .~.~ By means mounting a section to swing about a generally horizontal axis {1} | |
593 | DF | .~.~.~> With flexible means and winding drum |