US PATENT SUBCLASS 172 / 500
.~.~ Tool spring pressed downwardly

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}
500.~.~ Tool spring pressed downwardly

DEFINITION

Classification: 172/500

(under subclass 497) Apparatus in which the bias of the resilient means acts to move the earth working element downwardly.

SEE OR SEARCH THIS CLASS, SUBCLASS:

462, for plural tools which are individually spring-biased downwardly and raised as a unit.