(under subclass 25) Subject matter wherein the signal or phase comparator is of the electromechanical type (e.g., two-phase motor, the reference source being applied to one phase winding and the controlled oscillator output being applied to the other phase winding) or a frequency comparing means of the synchroscope type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
24, for A.F.S. controlled oscillators of the modulated oscillator type (e.g., frequency modulation of controlled oscillator) utilizing an electric motor comparator.
SEE OR SEARCH CLASS
324, Electricity: Measuring and Testing,
90, for electric current and voltage measuring systems utilizing a phase comparator of the electrodynamometer type, and subclass 91 for phase comparators of the synchroscope type.
