Before LCD and LED, this little bit of tech powered many of the screens we used. This particular example of a cathode ray tube (CRT) was made in Enfield, UK in 1960, 63 years after German physicist Karl Ferdinand Braun invented them. The tubes were once the primary display technology for computer monitors, televisions, radar and oscilloscopes. While CRTs are a type of technology that has been largely replaced, they remain a valuable piece of our history and a reminder of how rapidly technology changes.