US PATENT SUBCLASS 172 / 570
.~ With spring means other than for detent

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
570.~ With spring means other than for detent {2}
571  DF  .~.~> Spring is for tool group horizontal angling
572  DF  .~.~> Spring acts to move tool vertically {1}

DEFINITION

Classification: 172/570

(under subclass 518) Apparatus in which the rolling or rotating earth working element is provided with a spring other than one associated with a detent.