US PATENT SUBCLASS 33 / 272
.~ With magnetic compass

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

227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
272.~ With magnetic compass {1}
273  DF  .~.~> And level or plumb

DEFINITION

Classification: 33/272

(under subclass 227) Device including means responsive to an external magnetic field, usually that of the earth, for indicating direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

300+, for a direction indicator, per se, responsive to an external magnetic field.