US PATENT SUBCLASS 172 / 573
.~.~.~ Plural tools, individually spring urged

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
570  DF  .~ With spring means other than for detent {2}
572  DF  .~.~ Spring acts to move tool vertically {1}
573.~.~.~ Plural tools, individually spring urged

DEFINITION

Classification: 172/573

(under subclass 572) Apparatus comprising a plurality of said earth working elements, each being separately and individually acted on by a spring member.