(under subclass 518) Apparatus in which the rolling or rotating earth working tool is disclosed as a single, generally circular platelike member which is mounted on a frame or frame standard for free swinging, arcuate movement about a vertical axis whereby the member assumes or may freely assume different angular positions relative to the direction of draft as viewed in plan.
SEE OR SEARCH THIS CLASS, SUBCLASS:
748, for a freely pivoting tool other than a disc.
