US PATENT SUBCLASS 172 / 812
.~.~ With valve or pump for hydraulic control system

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}
812.~.~ With valve or pump for hydraulic control system

DEFINITION

Classification: 172/812

With valve or pump for hydraulic control system:

(under subclass 811) Apparatus wherein adjustment of the blade is performed by a control system which incorporates fluid circuitry, and including means for producing or controlling fluid pressure within the system.

SEE OR SEARCH CLASS

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