US PATENT SUBCLASS 172 / 689
.~.~ Closed geometrically shaped frame

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

681  DF  TOOL, STANDARD OR CONNECTION {32}
685  DF  .~ Plural tools {6}
689.~.~ Closed geometrically shaped frame

DEFINITION

Classification: 172/689

(under subclass 685) Apparatus in which the earth working elements are mounted at spaced intervals around a frame forming in plan view a geometric figure having a closed perimeter.

SEE OR SEARCH THIS CLASS, SUBCLASS:

648, for a diamond-shaped frame having tools carried by each of the sides thereof, the opposite apices of the diamond being adjustable toward and away from one another.