Nikola Tesla British Patent 16,709 - Improvements Relating to the Conversion of Alternating into Direct Electric Currents
Nikola Tesla U.S. Patent 685,955 - Apparatus for Utilizing Effects Transmitted From A Distance To A Receiving Device Through Natural Media
Nikola Tesla British Patent 20,981 - Improvements Relating to the Production, Regulation, and Utilization of Electric Currents of High Frequency, and to Apparatus Therefor
