US PATENT SUBCLASS 172 / 511
.~.~ Perforated or screening type

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

508  DF  WITH GUARD, SHIELD OR PLANT DIVERTER {3}
509  DF  .~ Fender for deflected earth {4}
511.~.~ Perforated or screening type

DEFINITION

Classification: 172/511

(under subclass 509) Apparatus in which said means comprises (1) a member having openings therein, or (2) a plurality of spaced members defining openings to permit the passage of material of a size smaller than the size of the openings through said means.