Stacked, i.e. one coil on top of the other

Full Title

Input/output interfacing specifically adapted for electrophonic musical tools or instruments > Transducers, i.e. details, positioning or use of assemblies to detect and convert mechanical vibrations or mechanical strains into an electrical signal, e.g. audio, trigger or control signal > Dual coil electrodynamic string transducer, e.g. for humbucking, to cancel out parasitic magnetic fields > Stacked, i.e. one coil on top of the other