US PATENT SUBCLASS 175 / 101
.~ With positive connection between tool and support shaft for rotary below ground motor

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}
101.~ With positive connection between tool and support shaft for rotary below ground motor

DEFINITION

Classification: 175/101

(under subclass 92) Apparatus in which the motor is a rotary type motor supported by a rotatable shaft extending into the bore, and in addition to the motor is a means provided for connecting said rotatable support shaft to the tool in a driving relationship.