(under subclass 613) Apparatus in which the plural earth working elements are mounted on a frame or support means and at least one of said elements is individually selectively translatable from one vertical position to another.
SEE OR SEARCH THIS CLASS, SUBCLASS:
650, for groups of tools which are horizontally and vertically adjustable.
655, for tools adjustable vertically and laterally.
744, for a single earth working element vertically adjustable.
