US PATENT SUBCLASS 172 / 820
.~.~.~.~ Blade angled about fixed, central, generally vertical axis

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

810  DF  MOUNTING FOR PUSHED TOOL AT END OF MOTOR VEHICLE {3}
811  DF  .~ Transversely mounted blade (e.g., bulldozer, etc.) {11}
818  DF  .~.~ Blade angle adjustable in a horizontal plane {2}
819  DF  .~.~.~ Power-operated adjusting means {2}
820.~.~.~.~ Blade angled about fixed, central, generally vertical axis {1}
821  DF  .~.~.~.~.~> And tilt of blade adjustable in a generally vertical plane

DEFINITION

Classification: 172/820

Blade angled about fixed, central, generally vertical axis:

(under subclass 819) Apparatus wherein the blade is connected to the mounting means at a point which does not move laterally and lies in a vertical plane that includes the longitudinal centerline of the vehicle, so that it pivots about a generally vertical axis through that point.