[[image:NeurophonePat01.png|thumb|Blockschaltbild einer frühen Version des Neurophone<ref name="pat1968">US Patent 3,393,279: Nervous system excitation device. Filed March 13, 1962. Patented July 16, 1968</ref>]] | [[image:NeurophonePat01.png|thumb|Blockschaltbild einer frühen Version des Neurophone<ref name="pat1968">US Patent 3,393,279: Nervous system excitation device. Filed March 13, 1962. Patented July 16, 1968</ref>]] |