ELECTRICAL COMMUNICATION APPARATUS, NAMELY, AMPLIFIERS AND PARTS THEREFOR, NAMELY, ANTENNAS, ANTENNA HOLDERS, MIXERS, SEPARATORS, LINE UNITS, SPLITTERS, DIRECTIONAL COUPLES, MATCHING TRANSFORMERS; ATTENUATORS, DUMMY LOAD RESISTORS, BOOSTERS, CONVERTERS, COAXIAL ELECTRIC CABLE, CONNECTORS, TWIN LEAD INSULATED ELECTRIC WIRE