US PATENT SUBCLASS 172 / 30
.~ Driven shifting means

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

29  DF  WITH MEANS FOR SHIFTING SURFACE MATERIAL WITHOUT SOIL DISTURBANCE {2}
30.~ Driven shifting means

DEFINITION

Classification: 172/30

(under subclass 29) Apparatus in which the means for shifting surface material is driven with a regular cyclic motion relative to its support or frame by a power means in addition to the motion imparted directly to the means by the translation of the device as a whole as it is moved across the surface of the ground being treated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

35+, for driven earth working elements or cleaners.