US PATENT SUBCLASS 172 / 523
.~.~ With vertically extending teeth

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.~.~ With vertically extending teeth {3}
524  DF  .~.~.~> Positioning means engaging circumference
525  DF  .~.~.~> With weight
526  DF  .~.~.~> Plural tools

DEFINITION

Classification: 172/523

(under subclass 522) Apparatus in which the earth working element is provided with one or more vertically disposed teeth, blades, or like earth working implements.