US PATENT SUBCLASS 172 / 564
.~.~.~ Mounted on rock shaft

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

518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
558  DF  .~ With disk cleaning means {6}
563  DF  .~.~ Cleaners with common operator {2}
564.~.~.~ Mounted on rock shaft

DEFINITION

Classification: 172/564

(under subclass 563) Apparatus in which the earth-removing means are each supported on a common elongated shaft which is turned about its axis to move the earth removing means.