Nikola Tesla U.S. Patent 568,176 - Apparatus for Producing Electrical Currents of High Frequency and Potential
Nikola Tesla British Patent 8575 - Improved Methods of and Apparatus for Generating and Utilizing Electric Energy for Lighting Purposes
Nikola Tesla Canadian Patent 142352 - Art of Transmitting Electrical Energy through the Natural Mediums
Nikola Tesla U.S. Patent 685,953 - Method of Intensifying and Utilizing Effects Transmitted Through Natural Media
