US PATENT SUBCLASS 172 / 6
.~.~ Electrical

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

2  DF  AUTOMATIC POWER CONTROL {5}
5  DF  .~ Obstruction sensing type (includes plant sensing) {1}
6.~.~ Electrical

DEFINITION

Classification: 172/6

(under subclass 5) Apparatus in which at least one of the sensing, controlling or power means is electrical.