US PATENT SUBCLASS 172 / 498
.~.~ Biased to neutral position

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}
497  DF  .~ Tool spring biased during operation {3}
498.~.~ Biased to neutral position

DEFINITION

Classification: 172/498

(under subclass 497) Apparatus in which the resilient means provides an opposite bias on the tool when the tool moves in either direction from a neutral position.