US PATENT SUBCLASS 172 / 389
.~ Spring 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}
389.~ Spring tooth implement {1}
390  DF  .~.~> Parallel pivoted tooth bars

DEFINITION

Classification: 172/389

(under subclass 387) Apparatus in which the wheel substitute is associated with an earth working element which is of spring form or is carried by a resilient standard.

SEE OR SEARCH THIS CLASS, SUBCLASS:

643, for an implement having a plurality of spring teeth.

707+, for an earth working tool comprising a spring in itself or a spring standard.