US PATENT SUBCLASS 175 / 38
.~ In response to drilling fluid circulation


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

24  DF  AUTOMATIC CONTROL {4}
38.~ In response to drilling fluid circulation


DEFINITION

Classification: 175/38

(under subclass 24) Subject matter in which a sensed characteristic of drilling fluid circulation controls a power operated means to modify the boring operation.

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25, for automatic control of fluid pressure below ground.

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173, Tool Driving or Impacting,

3, for automatic control of a power operated tool driving or impacting means in response to a condition of a cleansing means.