US PATENT SUBCLASS 172 / 541
.~.~ With means for preventing ground engagement of teeth or blades

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
540  DF  .~ Tool has circumferentially spaced teeth, tines, blades or the like {13}
541.~.~ With means for preventing ground engagement of teeth or blades

DEFINITION

Classification: 172/541

(under subclass 540) Apparatus in which there are means operable to move the earth working projections with respect to the rotating support therefor to prevent the engagement of the projections with the ground.

SEE OR SEARCH CLASS

301, Land Vehicles: Wheels and Axles,

46+, for vehicle wheels having adjustably mounted thereon traction increasing spurs or cleats.