US PATENT SUBCLASS 172 / 687
.~.~ Longitudinally spaced rows


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}
687.~.~ Longitudinally spaced rows {1}
688  DF  .~.~.~> Staggered


DEFINITION

Classification: 172/687

(under subclass 685) Apparatus having a plurality of rows of earth working elements (at least three elements to the row) extending transversely of the line of travel and traveling generally one behind the other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

379, for hand tools having plural rows of prongs or teeth.