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} |
276.1 | .~.~.~ With phase shifting, correcting, or regulating in the output path of one or more collectors |