20¢ American Inventors
Issue Date: September 21, 1983
City: Washington, DC
Printed By: Bureau of Engraving and Printing
Printing Method: Lithographed and engraved
This set of four stamps honors some of America's top inventors. Charles Steinmetz devised methods of harnessing high voltage for the Niagara Falls Power Plant, Edwin Armstrong invented FM radio, Nikola Tesla developed the generator and other devices that made alternating current (AC) possible, and Philo T. Farnsworth invented the first television camera.