US PATENT SUBCLASS 172 / 335
.~.~.~ With spring biasing means

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.~.~.~ With spring biasing means {1}
336  DF  .~.~.~.~> Spring biased upwardly during operation

DEFINITION

Classification: 172/335

(under subclass 333) Apparatus including resilient means to bias the earth working elements with respect to the wheeled frame or with respect to each other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

705+, spring-biased earth working elements.