US PATENT SUBCLASS 175 / 238
.~ Flow-stopping means includes relatively movable cutter element

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

232  DF  WITH MEANS MOVABLE RELATIVE TO TOOL BELOW GROUND TO STOP FLOW TOWARD BORE BOTTOM {8}
238.~ Flow-stopping means includes relatively movable cutter element

DEFINITION

Classification: 175/238

(under subclass 232) Apparatus in which at least part of the relatively movable, flow stopping means comprises a cutter element.