US PATENT SUBCLASS 172 / 447
.~.~ Rockable about vertical axis

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

439  DF  MAST TYPE HITCH (E.G., THREE POINT HITCH, ETC.) {10}
446  DF  .~ Laterally adjustable tool {1}
447.~.~ Rockable about vertical axis

DEFINITION

Classification: 172/447

(under subclass 446) Apparatus in which the earth working element is movable to a laterally adjusted position by a swinging movement about a generally vertical axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

477, for an earth working element liftable on a wheeled frame by means other than a mast-type hitch and adjustable about a vertical axis.

742, for a tool adjustable about a vertical axis.