US PATENT SUBCLASS 172 / 71
.~.~ Non-driven tool follows path of driven tool

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.~.~ Non-driven tool follows path of driven tool {1}
72  DF  .~.~.~> Leveling drag or furrow shaper

DEFINITION

Classification: 172/71

(under subclass 63) Apparatus in which the nondriven earth working element follows the path of the driven earth working element.