1970s, although never completely replacing the Moviola. By the mid-1990s, flatbeds were increasingly replaced by computer-based non-linear systems, such as Avid and Lightworks. As of 2007, some film schools were still using flatbed editors for their educational value. Feature films in the United States now use electronic non-linear systems almost exclusively. Brands The two most common brands of flatbed editor, Steenbeck and K-E-M (Keller-Elektro-Mechanik), were invented in Germany in the 1930s. There are also the Italian Prévost, the Dutch Oude Delft or Oldelft, the French Atlas as well as Moritone flatbeds. The U.K. produced the LEM, and America the Moviola flatbed and the exclusively 16 mm Showchron of which approximately 400 were produced in 4, 6, or 8 plate configurations, 6 being the most common. (A few 35 mm Showchrons were built, but never sold commercially.) All these machines employ a rotating prism rather than the Geneva drive intermittent mechanism first used by the American upright Moviola. The rotating prism allows the editor to move the film smoothly and continuously, reducing mechanical noise and film wear. It also makes high-speed operation feasible, and some machines can move the film at up to ten times standard speed. The K-E-M Universal, which has a modular construction, supports up to three picture heads and up to three soundtracks. See also Film editing Film splicer References Film editing