21 RADIO TRANSMITTERS AND RECEIVERS, TELEVISION SETS, RADIO RECEIVERS, TRANSMITTERS, AMPLIFIERS FOR HIGH- AND LOW-FREQUENCIES, COMBINATION LOUDSPEAKERS, MICROPHONES, HEAD PHONES, CONDENSERS, TELEPHONE SETS, AS WELL AS PARTS THEREOF; INDUCTORS; CORD DRIVES FOR INDICATING DEVICES-NAMELY, FREQUENCY OR CHANNEL SELECTOR SCALES OF RADIO-TELEVISION SETS, BOX-RADIOS, INSULATIONS FOR CONDUITS, AND CABLES