US PATENT SUBCLASS 172 / 728
.~.~.~ With additional blades attached to runner


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

681  DF  TOOL, STANDARD OR CONNECTION {32}
721  DF  .~ Non-rectangular, symmetrical type {8}
727  DF  .~.~ With attached runner or depth gauge {2}
728.~.~.~ With additional blades attached to runner


DEFINITION

Classification: 172/728

(under subclass 727) Apparatus in which the runner or depth gauge has connected thereto opposite laterally extending earth working blades which are additional to the earth working element, the device in its entirety being symmetrical.

SEE OR SEARCH THIS CLASS, SUBCLASS:

193+, for a tool for moving soil transversely of the line of travel and a sweep or blade spaced rearwardly thereof to act on the moved soil.