9 Electrical Apparatus and Instruments-Namely, Oscillators, Generators, Multipliers, Amplifiers, Circulators and Isolators, Receivers, Time Code Instruments, Converters, Transmitter Subsystems, and Supercomponents-Namely, Subsystems Consisting of at Least Two of the Following Components: Oscillators, Generators, Multipliers, Amplifiers, Isolators and Circulators