172 / | HD | EARTH WORKING |
324 | DF | WITH ACTUATOR ON TRAILING GROUND SUPPORTED FRAME FOR MOVING DRAFT MEANS LATERALLY OR VERTICALLY {2} |
326 | DF | .~ Vertically {1} |
327 | DF | .~.~ With vertically adjustable ground support {1} |
328 | .~.~.~ Interconnected means for adjusting draft means and ground support |