US PATENT SUBCLASS 172 / 566
.~.~ Spring biased toward disk

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
558  DF  .~ With disk cleaning means {6}
566.~.~ Spring biased toward disk

DEFINITION

Classification: 172/566

(under subclass 558) Apparatus in which the earth-removing means or a portion thereof is urged towards the platelike member.