21 COMMUNICATIONS EQUIPMENT AND PARTS THEREOF-NAMELY, RADIO ANTENNA SWITCHES, ANTENNA MULTICOUPLERS, PANORAMIC RADIO RECEIVERS, STATIC REJECTORS, WIDE BAND RADIO FREQUENCY TRANSFORMERS AND AMPLIFIERS, ULTRA HIGH FREQUENCY OSCILLATORS, MICROWAVE OSCILLATORS, HARMONIC GENERATORS, MICROWAVE AMPLIFIERS, RADIO FREQUENCY DOUBLERS, TELEMETRY TRANSMITTERS, RADIO TRANSMITTER-RECEIVER SYSTEMS AND ASSOCIATED EQUIPMENT THEREFOR