US PATENT SUBCLASS 342 / 36
AIR TRAFFIC CONTROL

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

36AIR TRAFFIC CONTROL {1}
37  DF  .~> Secondary Surveilance Radar (SSR) or Air Traffic Control Radar Beacon System (ATCRBS) {3}

DEFINITION

Classification: 342/36

AIR TRAFFIC CONTROL:

(under the class definition) Subject matter wherein a radar signal is used to maintain cognizance or to regulate the movement of aircraft in relation to each other or to other objects.

SEE OR SEARCH THIS CLASS, SUBCLASS:

454+, for directive position signaling for plurality of vehicles.