US PATENT SUBCLASS 175 / 241
.~ Stops flow by movement about fixed pivot

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}
241.~ Stops flow by movement about fixed pivot {1}
242  DF  .~.~> Pivot transverse to tool axis

DEFINITION

Classification: 175/241

(under subclass 232) Apparatus in which the movable means is pivotally mounted to move from flow permitting to flow blocking position.