US PATENT SUBCLASS 172 / 336
.~.~.~.~ Spring biased upwardly during operation

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

329  DF  GUIDED BY WALKING ATTENDANT; SUPPORTED, PROPELLED, OR HELD IN POSITION BY ATTENDANT {7}
332  DF  .~ Tool manipulated with respect to mounting frame {5}
333  DF  .~.~ Arched wheel frame (i.e., straddle row, etc.) {9}
335  DF  .~.~.~ With spring biasing means {1}
336.~.~.~.~ Spring biased upwardly during operation

DEFINITION

Classification: 172/336

(under subclass 335) Apparatus in which the resilient means tends to bias the earth working elements out of ground engagement during operation.