US PATENT SUBCLASS 172 / 391
.~ Spike tooth implement

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

387  DF  WITH WHEEL SUBSTITUTE (E.G., RUNNER, ETC.) {6}
391.~ Spike tooth implement

DEFINITION

Classification: 172/391

(under subclass 387) Apparatus in which the wheel substitute is associated with an earth working element in which the earth working portion is no longer in lateral or longitudinal extent than the standard which supports it in earth working position.