US PATENT SUBCLASS 342 / 123
.~ Height finder

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

118  DF  DETERMINING DISTANCE {11}
123.~ Height finder

DEFINITION

Classification: 342/123

Height finder:

(under subclass 118) Subject matter including determining the distance from the earth's surface to an aircraft from the ground.

(1) Note. Earth curvature correction (ECC) circuits are included in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38, for air traffic control system with altitude information.