US PATENT SUBCLASS 342 / 406
.~.~.~.~.~.~ With circular array of antennas


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

350  DF  DIRECTIVE {10}
385  DF  .~ Beacon or receiver {2}
386  DF  .~.~ With transmisson of bearing or position determinative signals {6}
399  DF  .~.~.~ Tacan {2}
404  DF  .~.~.~.~ VOR {1}
405  DF  .~.~.~.~.~ Doppler {1}
406.~.~.~.~.~.~ With circular array of antennas


DEFINITION

Classification: 342/406

With circular array of antennas:

(under subclass 405) Subject matter wherein the antennas are arrayed in a ring shaped pattern.