(under subclass 613) Apparatus in which a pair of longitudinally extending earth working element supporting beams are provided with a lateral adjustable means comprising a yoke lying in a transverse vertical plane and in which the yoke comprises a pair of arms pivoted to each other at one end and having the other ends thereof interconnected to the element beams, the arms being adjustable relative to each other about the pivot to thereby spread the beams in a traverse direction relative to each other.
(1) Note. For meaning of "adjustable", see the class definition.
