US PATENT SUBCLASS 172 / 221
.~.~ Plural tools shifted about individual vertical axes

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

204  DF  ALTERNATING FOR RIGHT OR LEFT HAND OPERATION (OTHER THAN SCRAPER) {10}
219  DF  .~ Tool shifted for opposite throw {3}
221.~.~ Plural tools shifted about individual vertical axes {1}
222  DF  .~.~.~> With translational movement of axes

DEFINITION

Classification: 172/221

(under subclass 219) Apparatus including a plurality of earth working elements, each operative to move soil in opposite directions, the earth working elements being adjustable about spaced vertical axes to reverse the direction of soil movement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

569, for a plurality of disks which are pivoted on vertical axes with interconnected means for moving them identically without shifting them for opposite throw.

647, for plural relatively movable tools which are simultaneously adjusted about their individual vertical axes without being shifted for opposite throw.