| 333 / | HD | WAVE TRANSMISSION LINES AND NETWORKS |
| 1 | DF | PLURAL CHANNEL SYSTEMS {4} |
| 100 | DF | .~ Having branched circuits {6} |
| 124 | DF | .~.~ With impedance matching {4} |
| 125 | DF | .~.~.~ Including long line element {2} |
| 126 | ![]() | .~.~.~.~ For providing frequency separation |