US PATENT SUBCLASS 340 / 957
.~.~.~ Magnetic field guide

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

945  DF  AIRCRAFT ALARM OR INDICATING SYSTEMS {11}
947  DF  .~ Land-based landing guidance {5}
952  DF  .~.~ Particular energy guide source (e.g., sound, electric field, radio) {2}
957.~.~.~ Magnetic field guide

DEFINITION

Classification: 340/957

Magnetic field guide:

(under subclass 952) Subject matter wherein the guide source is a conductor or coil carrying a current within which moving electric charges will be acted upon by a magnetic force.