US PATENT SUBCLASS 33 / 319
.~.~ 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}
318  DF  .~ Gyroscopically controlled or stabilized {5}
319.~.~ Magnetic compass

DEFINITION

Classification: 33/319

(under subclass 318) Device wherein a directional indicator influenced by an external magnetic field is additionally controlled or stabilized by the gyroscope.

SEE OR SEARCH THIS CLASS, SUBCLASS:

316, for a directional gyroscope con- trolled by a magnetic compass.

355+, for a magnetic compasses, per se.