Nikola Tesla U.S. Patent 568,178 - Method of Regulating Apparatus for Producing Electric Currents of High Frequency
Nikola Tesla British Patent 174,544 - Improvements in Methods of and Apparatus for the Generation of Power by Elastic Fluid Turbines
Nikola Tesla British Patent 20,981 - Improvements Relating to the Production, Regulation, and Utilization of Electric Currents of High Frequency, and to Apparatus Therefor
