US PATENT SUBCLASS 172 / 347
.~.~ Spring biased

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}
347.~.~ Spring biased

DEFINITION

Classification: 172/347

(under subclass 332) Apparatus in which there is provided a resilient means which biases the earth working element during operation.