formats, using a width, with the DCT format using DCT (discrete cosine transform) video compression, also its namesake. The DCT and DST formats yielded relatively high capacity and speed for data and video. Double-density DST data storage was introduced in 1996. The final generation of these products were quad density, introduced in 2000, resulting in a large cartridge holding 660GB of data. Milestones In 1948, the first tape-delayed U.S. radio program was broadcast by using an Ampex Model 200 tape recorder. In May 1949 Model 300 introduced improvements in audio head, tape drive and tape path. In 1950, Model 400 introduced lower cost professional quality audio recorder, soon to be replaced by the Model 400A, which was the logical precursor of the Model 350. In 1950, Ampex introduced the first "dedicated" instrumentation recorder, Model 500, built for the U.S. Navy. In April 1953 Model 350 introduced audio recorder to replace the Model 400/Model 400A. The Model 350 had more simplicity and durability. Ampex released the 35 mm four-track CinemaScope stereo reproduction system. In May 1954 Model 600 introduced mastering quality audio portable recorder. Models 3200-3300 high-speed duplicators also introduced. In 1954, in a recording studio equipped with an Ampex reel-to-reel audio tape recording machine, an unknown truck driver named Elvis Presley recorded his historic first single, "That's All Right" at Sun Studios in Memphis. Also that year, Ampex introduced the first multi-track audio recorder derived from multi-track data recording technology. In 1955, Ampex released the 70 mm and 35 mm six-track and four-track Todd-AO system, and an improved 35mm four-track system. On March 14, 1956, The Ampex VRX-1000 (later renamed the Mark IV) videotape recorder is introduced at the National Association of Radio and Television Broadcasters in Chicago. This is the first practical videotape recorder and is hailed as a major technological breakthrough. CBS goes on air with the first videotape delayed broadcast, Douglas Edwards and The News, on November 30, 1956, from Los Angeles, California, using the Ampex Mark IV. In March 1957, Ampex won an Emmy award for the invention of the Video Tape Recorder (VTR). In 1958, NASA selected Ampex data recorders and magnetic tape. It has been used for virtually all U.S. space missions since. In 1959, the Nixon-Khrushchev Kitchen Debate was recorded on Ampex videotape. The fact that the debate was being videotaped was mentioned by Nixon as an example of American technological development. In