US PATENT SUBCLASS 172 / 651
.~.~.~ Group pivoted about vertical axis

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.~.~.~ Group pivoted about vertical axis {1}
652  DF  .~.~.~.~> V-shaped {1}

DEFINITION

Classification: 172/651

(under subclass 649) Apparatus in which the relatively movable earth working element groups are adjustably connected one to the other or a group is adjustably connected to a supporting frame by vertically extending pivot means whereby such group may be rotated about said pivot means.

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

647, for a plurality of earth working elements simultaneously pivoted about individual vertical axes.