US PATENT SUBCLASS 342 / 121
.~.~ With additional indicator

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  DF  .~ Altimeter {2}
121.~.~ With additional indicator

DEFINITION

Classification: 342/121

With additional indicator:

(under subclass 120) Subject matter including means to display information in addition to altitude.