US PATENT SUBCLASS 172 / 99
.~.~ About generally vertical axis

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
98  DF  .~ Tool mounted for lateral shifting {1}
99.~.~ About generally vertical axis

DEFINITION

Classification: 172/99

(under subclass 98) Apparatus in which the earth working element is swingable on a fixed radius about a fixed vertical axis in a generally horizontal plane transversely across the line of travel of said element.