US PATENT SUBCLASS 175 / 269
.~.~ Fluid pressure acts against spring biased part

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

263  DF  CUTTER ELEMENT LATERALLY SHIFTABLE BELOW GROUND (E.G., EXPANSIBLE) {13}
267  DF  .~ Cutter element shifted by fluid pressure {2}
269.~.~ Fluid pressure acts against spring biased part

DEFINITION

Classification: 175/269

(under subclass 267) Apparatus in which the laterally movable cutter element or part acted on by the pressure fluid is also acted upon by a resilient means urging the cutter element or part in a direction opposite to that exerted by the pressure fluid.