US PATENT SUBCLASS 175 / 93
.~ Below-ground (1) generation of motive fluid, or (2) storage of motivating energy

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}
93.~ Below-ground (1) generation of motive fluid, or (2) storage of motivating energy

DEFINITION

Classification: 175/93

(under subclass 92) Apparatus in which (1) the motor is fluid operated, and means are provided within the borehole for generating or imparting energy to the motive fluid, (2) means are provided within the borehole for storing a source of motivating energy for operating the motor.