US PATENT SUBCLASS 172 / 653
.~.~.~.~.~ Nested

Current as of: June, 1999
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172 /   HD   EARTH WORKING

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
645  DF  .~ Tools relatively adjustable horizontally without causing vertical displacement {7}
649  DF  .~.~ Tool groups relatively horizontally adjustable {2}
651  DF  .~.~.~ Group pivoted about vertical axis {1}
652  DF  .~.~.~.~ V-shaped {1}
653.~.~.~.~.~ Nested

DEFINITION

Classification: 172/653

(under subclass 652) Apparatus in which the groups of earth working elements are so disposed as to form two V-shaped implements in plan view with the vertex of each V pointing in generally the same direction and the vertex of one V lying between the arms of the other V.