US PATENT SUBCLASS 172 / 77
.~.~ Vertically biased implement

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

35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
76  DF  .~ Implement with ground support for depth control {3}
77.~.~ Vertically biased implement

DEFINITION

Classification: 172/77

(under subclass 76) Apparatus in which the driven implement is provided with a resilient means for normally biasing said implement in a vertical plane.

SEE OR SEARCH THIS CLASS, SUBCLASS:

117, for driven tools which are provided with a resilient means for yieldably biasing the same on a chassis.

497, for nondriven tools which are spring biased in a vertical plane and which are provided with ground support means.