(under subclass 101) Subject matter wherein the operation performed on an electrical signal is multiplication or division.
SEE OR SEARCH CLASS
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
113+, for miscellaneous frequency control.
332, Modulators,
112+, for pulse frequency modulators.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, appropriate subclasses for pulse dividing and multiplying circuits.