The IBM System/370 Model 145, 1970. The System/370 Model 145 was the first general-purpose business computer to use monolithic circuits in all memory and logic functions, and used semiconductor technology rather than magnetic cores.
Michael Faraday’s induction ring, used in experiments that led to the discovery of electromagnetic induction on August 29th, 1831. Faraday wrapped two wires around opposite sides of an iron ring, inserting one into a galvanometer and the other into a battery. He observed “waves of electricity” resulting from the change in magnetic flux.