Nikola Tesla's Unpopular Inventions

Even less known is that in the process of making the first radio controlled anything in 1898 Nikola Tesla made first electronic logic circuits!

http://www.tfcbooks.com/teslafaq/q&a_024.htm

"After World War II when computer hardware manufacturers attempted to patent digital logic gates in general, the U.S. Patent Office asserted Tesla's turn-of-the-century priority in their electrical implementation."