455 / | HD | TELECOMMUNICATIONS |
130 | DF | RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24} |
269 | DF | .~ With wave collector (e.g., antenna) {4} |
272 | DF | .~.~ Plural separate collectors {5} |
278.1 | DF | .~.~.~ Combined with noise or interference elimination {1} |
279.1 | .~.~.~.~ Plural antenna currents entering single transformer |