US PATENT SUBCLASS 340 / 952
.~.~ Particular energy guide source (e.g., sound, electric field, radio)

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.~.~ Particular energy guide source (e.g., sound, electric field, radio) {2}
953  DF  .~.~.~> Visual source {3}
957  DF  .~.~.~> Magnetic field guide

DEFINITION

Classification: 340/952

Particular energy guide source (e.g., sound, electric field, radio):

(under subclass 947) Subject matter including the use of a specific type of energy in the guide source.

SEE OR SEARCH CLASS

342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation),

385+, for directive beacons.