US PATENT SUBCLASS 166 / 363
.~ With safety or emergency shutoff

Current as of: June, 1999
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166 /   HD   WELLS

335  DF  SUBMERGED WELL {10}
363.~ With safety or emergency shutoff

DEFINITION

Classification: 166/363

With safety or emergency shutoff:

(under subclass 335) Device combined with means to terminate the flow of well fluid under conditions that would otherwise endanger the well or environment (including personnel) or other extreme conditions.