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

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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.