US PATENT SUBCLASS 172 / 445.2
.~.~ Angularly adjustable 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}
445.1  DF  .~ Including blade, scraper, or smoother {1}
445.2.~.~ Angularly adjustable about vertical axis

DEFINITION

Classification: 172/445.2

Angularly adjustable about vertical axis:

(under subclass 445.1) Apparatus in which the earth working element is mounted so to be movable about a vertical axis to a different angular position.