| 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} |
| 407 | DF | .~.~.~ Fixed course or bearing indicating {5} |
| 408 | | .~.~.~.~ Moving beam |