| 333 / | HD | WAVE TRANSMISSION LINES AND NETWORKS | 
| 1 | DF | PLURAL CHANNEL SYSTEMS {4} | 
| 100 | DF | .~ Having branched circuits {6} | 
| 101 | DF | .~.~ Including switching means {3} | 
| 105 | DF | .~.~.~ Having mechanical switching means {2} | 
| 106 | ![]()  | .~.~.~.~ Using rotary switching means {1} | 
| 107 | DF | .~.~.~.~.~> For TEM lines |