US PATENT SUBCLASS 33 / 310
.~.~.~ Includes magnetic directional indicator

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

Internet Version by PATENTEC © 1999      Terms of Use


33 /   HD   GEOMETRICAL INSTRUMENTS

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
304  DF  .~ Borehole direction or inclination {6}
308  DF  .~.~ Pendulum mounted or directed marker {3}
310.~.~.~ Includes magnetic directional indicator

DEFINITION

Classification: 33/310

(under subclass 308) Device provided with means influenced by a magnetic field to determine the bearing of the well bore.

SEE OR SEARCH THIS CLASS, SUBCLASS:

313, for other borehole inclination and directional indicators.

355, for magnetic indicators in general.