Evolution of Technology By 21faulla 1843 1843: Typewriter invented 1920 1920: Radio classes 1922 1922: TV invented 1923 1923: Overhead Projector created 1972 1972: Handheld calculators 1972 1972: Scranton’s invented 1975 1975: Laser printer is invented 1977 1977: Apple introduces first personal computer 1979 1979: Personal headset is invented
