US PATENT SUBCLASS 172 / 621
.~.~.~ Spring biased bars

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

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
619  DF  .~ Plural tool groups relatively vertically movable because of operation {9}
620  DF  .~.~ Parallel transverse tooth bars {2}
621.~.~.~ Spring biased bars

DEFINITION

Classification: 172/621

(under subclass 620) Apparatus in which the tooth bars are resiliently mounted so that they may independently or simultaneously pivot or yield against the action of a biasing means.