US PATENT SUBCLASS 175 / 21
.~ Fluid passage to exterior of drive point

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

19  DF  BORING WITHOUT EARTH REMOVAL (I.E., COMPACTING EARTH FORMATION) {3}
21.~ Fluid passage to exterior of drive point

DEFINITION

Classification: 175/21

(under subclass 19) Subject matter relating to conducting fluid through the drive point to the exterior thereof, generally to lubricate or treat the earth formation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

227+, for lubricant fluid storage means carried by the tool or tool shaft.