US PATENT SUBCLASS 172 / 706
.~.~ Plural earth engaging parts relatively movable during operation

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

681  DF  TOOL, STANDARD OR CONNECTION {32}
705  DF  .~ Spring biased or formed tool or tool part {5}
706.~.~ Plural earth engaging parts relatively movable during operation

DEFINITION

Classification: 172/706

(under subclass 705) Apparatus in which the earth working element includes a plurality of distinct earth-engaging portions movable relative to one another during operation and resilient means resisting said relative movement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

707+, for tools which are entirely of spring form or are

mounted upon a spring standard or support.

714+, for tools having plural earth-engaging parts relatively movable during operation.