455 / | HD | TELECOMMUNICATIONS |
73 | DF | TRANSMITTER AND RECEIVER AT SAME STATION (E.G., TRANSCEIVER) {9} |
550 | DF | .~ Radiotelephone equipment detail {17} |
557 | DF | .~.~ Interface attached device (e.g., interface with modem, facsimile, computer, etc.) {2} |
559 | .~.~.~ Smart cable |