US PATENT SUBCLASS 172 / 571
.~.~ Spring is for tool group horizontal angling

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
570  DF  .~ With spring means other than for detent {2}
571.~.~ Spring is for tool group horizontal angling

DEFINITION

Classification: 172/571

(under subclass 570) Apparatus in which a spring affects movement of a group of said earth working elements so as to change the angle of the axis or axes of rotation of the elements in plan view.