Computer History By Bla.Bla.Bla123 Jan 1, 1786 Difference engine An olger calculator Jan 1, 1957 Stereo Made to play and record your music Jan 1, 1961 Calculator Made to calculate short difficult equations. Jan 1, 1971 Laptops A portable computer Jan 1, 1973 Mobile Phone Portable Phone to contact people. Nowdays has more uses. Jan 1, 2014 Samsung Gear Wearable tech