US PATENT SUBCLASS 166 / 358
.~.~ Drilling means


Current as of: June, 1999
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166 /   HD   WELLS

335  DF  SUBMERGED WELL {10}
351  DF  .~ Means removably connected to permanent well structure {7}
358.~.~ Drilling means


DEFINITION

Classification: 166/358

Drilling means:

(under subclass 351) Process or apparatus including means for forming a passageway.