(under subclass 124) Subject matter comprising means for converting an input signal having a certain characteristic to another signal having a different characteristic.
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198, for measurement conversion processing in which measuring unit is converted from one to an another.
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327, Miscellaneous Active Electrical Nonlinear Devices, Circuits and Systems,
101, for converting input current or voltage to output frequency, subclass 102 for converting input frequency to output current or voltage, subclass 103 for converting input voltage to output current or vice versa, subclass 104 converting, per se, of an AC input to corresponding DC at an unloaded output, and subclasses 113+ for frequency or repetition rate conversion or control.