US PATENT SUBCLASS 172 / 72
.~.~.~ Leveling drag or furrow shaper

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
63  DF  .~ With non-driven tool (e.g., plow, harrow, drag, scraper, knife or roll, etc.) {8}
71  DF  .~.~ Non-driven tool follows path of driven tool {1}
72.~.~.~ Leveling drag or furrow shaper

DEFINITION

Classification: 172/72

(under subclass 71) Apparatus in which the nondriven earth working element comprises a ground-engaging forming member having a lower surface shape which is substantially flat or horizontal or which is upwardly concave to form a cross sectional configuration which is desired to be imparted to the disturbed earth behind the driven earth working element.