US PATENT SUBCLASS 172 / 70
.~.~ Fore-and-aft non-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}
70.~.~ Fore-and-aft non-driven tool

DEFINITION

Classification: 172/70

(under subclass 63) Apparatus in which the driven earth working element is disposed between a first forwardly positioned nondriven earth working element and a second rearwardly positioned nondriven earth working element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

145+, for three or more diverse tools following the same path, all of such tools being nondriven earth working tools.