US PATENT SUBCLASS 172 / 464
.~ Servo-motor forces tool down

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

452  DF  WITH ACTUATOR ADAPTED TO LIFT TOOL FOR TRANSPORT ON WHEELED FRAME OR BROADLY CLAIMED IMPLEMENT {37}
464.~ Servo-motor forces tool down

DEFINITION

Classification: 172/464

(under subclass 452) Apparatus in which the earth working element is positively moved in a downward direction by a servomotor.

(1) Note. A device in which the earth working element is pivotally connected to and trails behind a member which is positively forced down by a servomotor is included in this definition.