(under subclass 250) Apparatus in which the alteration comprises placing an earth working element in distinctly different positions relative to adjacent supporting structure so that the element may perform its earth working function in each of these different positions.
SEE OR SEARCH THIS CLASS, SUBCLASS:
554, for a disk changeable to positions having a different angular relationship to adjacent structure when viewed in plan.
577, for a reversible group of rolling earth working elements.
581, for groups of disks changeable to different arrangements.
702+, for a reversible part. Where the rearrangement of a tool results merely from reversing a nonrolling tool or part thereof, a standard, or a reversible part between such a tool and a standard or the standard and a beam, classification is in subclasses 702+. 735, for an earth working element adjustable to prevent a different working portion.
