US PATENT SUBCLASS 33 / 313
.~.~ Inclination and direction indications

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
304  DF  .~ Borehole direction or inclination {6}
313.~.~ Inclination and direction indications

DEFINITION

Classification: 33/313

(under subclass 304) Device including means for determining both the bearing of the borehole and the deviation of the borehole from the vertical.

SEE OR SEARCH THIS CLASS, SUBCLASS:

310, for a borehole pendulum inclinator and magnetic heading indicator.

351+, for other plural directional indicators.