US PATENT SUBCLASS 342 / 120
.~ Altimeter

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}
120.~ Altimeter {2}
121  DF  .~.~> With additional indicator
122  DF  .~.~> FM type

DEFINITION

Classification: 342/120

Altimeter:

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

38, for air traffic control systems with altitude information.