US PATENT SUBCLASS 172 / 819
.~.~.~ Power-operated adjusting means

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.~.~.~ Power-operated adjusting means {2}
820  DF  .~.~.~.~> Blade angled about fixed, central, generally vertical axis {1}
822  DF  .~.~.~.~> And tilt of blade adjustable

DEFINITION

Classification: 172/819

Power-operated adjusting means:

(under subclass 818) Apparatus including a power system for moving the blade from one angular orientation to another.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type, appropriate subclass for a hydraulic motor, per se.