(under subclass 137) Subject matter wherein the inductor device is provided with a plurality of coil sections or a coil having means (e.g., taps) for making contact with the coil conductor at different places, the inductor device including means (e.g., a switch) to reverse the inductive effect of one coil section or part with respect to another coil section or part, and to thereby change the effective inductance of the inductor device.
