US PATENT SUBCLASS 172 / 25
.~ Rotatable about vertical axis

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

23  DF  DRIVEN FROM OR GUIDED BY STATIONARY OBJECT, OR ANCHORED {4}
25.~ Rotatable about vertical axis

DEFINITION

Classification: 172/25

(under subclass 23) Apparatus in which the earth working means is rotated about an upright axis while the apparatus is anchored to or supported on the ground so as to prevent translational movement.

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24, for an implement attached to or guided in a rotary path by a fixed vertical member (e.g., tree or stake).