US PATENT SUBCLASS 175 / 173
.~ With diversely operated shafts extending into bore

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

170  DF  WITH TOOL DRIVE PRIME MOVER OR ABOVE-GROUND MECHANICAL MOTION CONVERTING DRIVE MEANS {5}
173.~ With diversely operated shafts extending into bore

DEFINITION

Classification: 175/173

(under subclass 170) Apparatus in which means are provided to simultaneously or consecutively move in a different manner, plural shafts which extend into a bore; the shafts generally consist of two tool drive shafts, or a tool drive shaft and a tool actuating shaft.