In 1895 – The first demonstration of A A Popov’s electromagnetic wave receiver took place at a meeting of the Russian Physical Chemical Society in St.- Petersburg. It was essential to the development of wireless communications.
Also In 1895 – Otto Steiger received a patent for the Millionaire calculating machine. Switzerland’s Hans Egli made 4,700 of the 120-pound things. The Millionaire’s chief feature was the ability to do direct multiplication with a single rotation of the handle!
In 1952 – British radar engineer Geoffrey Dummer introduced the concept of the integrated circuit at the Symposium on Progress in Quality Electronic Components in Washington, D.C.