US PATENT SUBCLASS 175 / 95
.~ Plural below-ground drive prime movers

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

92  DF  WITH BELOW-GROUND TOOL DRIVE PRIME MOVER {11}
95.~ Plural below-ground drive prime movers {1}
96  DF  .~.~> Plural cutter elements driven by individual prime movers

DEFINITION

Classification: 175/95

(under subclass 92) Apparatus comprising a plurality of drive motors positioned within the borehole.