US PATENT SUBCLASS 172 / 108
.~.~ Rotary driven tool

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
107  DF  .~ Tool driven about horizontal, longitudinal axis {1}
108.~.~ Rotary driven tool {1}
109  DF  .~.~.~> Adjustable tooth or blade

DEFINITION

Classification: 172/108

(under subclass 107) Apparatus in which the driven earth working element rotates about an axis.