US PATENT SUBCLASS 172 / 525
.~.~.~ With weight

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}
525.~.~.~ With weight

DEFINITION

Classification: 172/525

(under subclass 523) Apparatus including a weight or a means specifically designed to support a weight.