US PATENT SUBCLASS 172 / 524
.~.~.~ Positioning means engaging circumference

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
522  DF  .~ Axis substantially vertical {1}
523  DF  .~.~ With vertically extending teeth {3}
524.~.~.~ Positioning means engaging circumference

DEFINITION

Classification: 172/524

(under subclass 523) Apparatus in which a means engages the peripheral portion of the earth working element to control or to aid in controlling the position of the earth working element.