US PATENT SUBCLASS 172 / 115
.~.~ Tool steers implement

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
114  DF  .~ Specific propelling means {2}
115.~.~ Tool steers implement

DEFINITION

Classification: 172/115

(under subclass 114) Apparatus in which the driven earth working element is used to steer the apparatus in the desired direction as it traverses the ground.