US PATENT SUBCLASS 33 / 352
.~.~ Includes magnetic compass

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

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
351  DF  .~ Diverse directional indicator {2}
352.~.~ Includes magnetic compass

DEFINITION

Classification: 33/352

(under subclass 351) Device wherein one of the directional indicators is influenced by an external magnetic field (e.g., combined magnetic compasses and inclinometers).

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

313, for inclination and direction indicators for boreholes.

355+, for magnetic compasses, per se.