(under subclass 1) Subject matter in which the superimposed unlike currents have different frequencies or phase.
SEE OR SEARCH THIS CLASS, SUBCLASS:
27, for similar subject matter.
SEE OR SEARCH CLASS
84, Music,
600+, especially subclasses 600+ for electric organs having means for superimposing currents of different frequency upon a common circuit.
332, Modulators, appropriate subclasses for systems for introducing frequency components by a modulation process. 363, Electric Power Conversion Systems,
1+, 39+, and 157+ for electric power conversion systems having means to introduce or to eliminate certain frequency components.
