| 455 / | HD | TELECOMMUNICATIONS |
| 130 | DF | RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24} |
| 296 | DF | .~ Noise or interference elimination {10} |
| 303 | DF | .~.~ Using plural separate signal paths {2} |
| 305 | ![]() | .~.~.~ With balancing or neutralizing {1} |
| 306 | DF | .~.~.~.~> Filter in at least one path |