198 / | HD | CONVEYORS: POWER-DRIVEN |
860.1 | DF | CONVEYOR FRAME OR CASING {3} |
861.1 | DF | .~ Adjustable conveyor frame or casing {4} |
861.2 | .~.~ Conveyor frame or casing flexes or pivots intermediate its ends to move one end relative to the other {1} | |
861.3 | DF | .~.~.~> Single horizontal pivot axis only |