US PATENT SUBCLASS 33 / 357
.~.~.~ Error-producting-field minimizing

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

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
355 R  DF  .~ Magnetic field responsive {6}
356  DF  .~.~ Error indicator, preventor, or compensator {1}
357.~.~.~ Error-producting-field minimizing {1}
358  DF  .~.~.~.~> Adjustable positioned permanent magnet {1}

DEFINITION

Classification: 33/357

(under subclass 356) Device wherein the means prevents the extraneous force from affecting the magnetically influenced means by either absorbing said extraneous force or providing an opposing force of an equal amount.