US PATENT SUBCLASS 172 / 650
.~.~.~ Also vertically adjustable

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}
650.~.~.~ Also vertically adjustable

DEFINITION

Classification: 172/650

(under subclass 649) Apparatus in which there is a group of earth working elements adjustable in a vertical sense, said adjustment being capable of occurring at a time different than the horizontal movement of this or some other group.

(1) Note. For the meaning of "adjustable" see the class definition.