US PATENT SUBCLASS 172 / 830
.~.~.~ Power means is fluid servomotor

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}
828  DF  .~.~ With power means for raising and lowering blade {2}
830.~.~.~ Power means is fluid servomotor {1}
831  DF  .~.~.~.~> Plural servomotors

DEFINITION

Classification: 172/830

Power means is fluid servomotor:

(under subclass 828) Apparatus in which the power system includes a device which has a piston movable within a cylinder by fluid pressure.