US PATENT SUBCLASS 172 / 731
.~.~ Lateral extent decreases upwardly


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}
731.~.~ Lateral extent decreases upwardly


DEFINITION

Classification: 172/731

(under subclass 721) Apparatus in which the earth working element has a given dimension transverse to the direction of travel at a lower portion thereof which dimension decreases at a portion of the element vertically spaced upwardly from the lower portion.

(1) Note. A tool having a reduced upward extension merely to form an attaching means for the tool is not included under this definition.