US PATENT SUBCLASS 175 / 96
.~.~ Plural cutter elements driven by individual 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  DF  .~ Plural below-ground drive prime movers {1}
96.~.~ Plural cutter elements driven by individual prime movers

DEFINITION

Classification: 175/96

(under subclass 95) Apparatus wherein the tool is composed of a plurality of relatively movable cutting elements, each of said cutting elements being driven by a separate motor.