.~ Plural tool groups relatively vertically movable because of operation {9}
628
.~.~ Similar groups arranged to form a triangular shape
DEFINITION
Classification: 172/628
(under subclass 619) Apparatus comprising a pair of laterally spaced transversely aligned earth working element groups and a third earth working element group longitudinally spaced from the first named groups, the longitudinally center line of the third element group extending in a line between the first two groups, all the groups being substantially similarly shaped.
