US PATENT SUBCLASS 172 / 59
.~.~.~ Vertical axes

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
48  DF  .~ Plural driven tools {6}
57  DF  .~.~ Laterally spaced tools {3}
59.~.~.~ Vertical axes

DEFINITION

Classification: 172/59

(under subclass 57) Apparatus in which the axes of cyclic movement of the spaced earth working elements are parallel to each other and are disposed perpendicular to the earth's surface.