342 / | HD | COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION) |
350 | DF | DIRECTIVE {10} |
450 | DF | .~ Position indicating (e.g., triangulation) {11} |
463 | .~.~ Having plural transmitters or receivers {2} | |
464 | DF | .~.~.~> Plural transmitters only |
465 | DF | .~.~.~> Plural receivers only |