US PATENT SUBCLASS 172 / 4
.~ Constant depth type

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

2  DF  AUTOMATIC POWER CONTROL {5}
4.~ Constant depth type

DEFINITION

Classification: 172/4

(under subclass 2) Apparatus in which the sensing means contacts or senses the surface of the ground and acts to maintain the earthworking element at a preselected depth therein.