US PATENT SUBCLASS 172 / 530
.~.~.~ Wheel or motor controlled

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
528  DF  .~ With means for stopping or retarding rotation {1}
529  DF  .~.~ Positive stop {1}
530.~.~.~ Wheel or motor controlled

DEFINITION

Classification: 172/530

(under subclass 529) Apparatus in which the stop means is controlled by the motion of a ground wheel or by a motor so that the rotating earth working element is periodically released under control of the wheel or motor as the apparatus is advanced over the ground.