US PATENT SUBCLASS 172 / 520
.~ Tools on different axes in mutual driving relationship

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
520.~ Tools on different axes in mutual driving relationship

DEFINITION

Classification: 172/520

(under subclass 518) Apparatus comprising earthworking elements on different axes and interconnected so that the motion of one is constrained to correspond with the motion of the other.