Basic Research and Investigation: 1882: Caselli developed a crude system of phototelegraphy capable of long-distance image transmission. 1875: Carey designed a crude television system utilizing selenium cells. 1878: Crooks developed the cathode-ray vacuum tube. 1884: Nipkov developed a mechanical scanning system suitable for transmitting stationary images. 1897: Braun developed the cathode-ray oscilloscope by adding a fluorescent screen to a cathode-ray vacuum tube and controlling the path of the electron beam with electromagnets. Incubation Period: 1907: Rosen developed and patented a device for receiving television pictures from a nearby mechanical television transmitter. 1907: DeForest developed the 3-element (triode) vacuum tube. 1923: Zworykin patented an electronic camera tube embodying the basic concepts of electronic scanning. 1924: Bell Laboratories undertook a research program on mechanical television scanning systems. 1927: Bell Laboratories made the first long-distance television broadcast from Washington to New York using a mechanical scanning system. 1928: Zworykin developed a practical electronic scanning tube for television transmission. Commercial Development: 1929: Bell Laboratories conducted a successful color television broadcast. 1930: Bell Laboratories established an experimental two- way television transmission system to A.T. & T/s headquarters in New York City. 1935: RCA Laboratories developed a high-resolution television system similar to the one presently used. 1936: RCA constructed an experimental television transmitting station atop the Empire State Building and successfully transmitted pictures 45 miles. 1937: Seventeen experimental television stations were in operation. 1939: Dumont Co. manufactured the first commercial television set 1939: The Milwaukee Journal filed the first application with the FCC for a commercial television broadcasting license. 1940: CBS publicly demonstrated a mechanical color television system. 1941: The FCC authorized the start of commercial television broadcasting on July 1,1941. 1942: The manufacture of all television broadcasting and receiving equipment was suspended for the duration of World War II, with about 10,000 television sets in consumer use. Commercial Growth: 1945: Production of consumer television receivers was resumed, and the FCC allocated 13 VHP channels for commercial television broadcasting. ? 946: The FCC received the first petition for color television from CBS which was subsequently deferred until standards could be established. 1947: RCA announced development of a color television system that was compatible with black-and-white television broadcasting. 1948: The issuance of new television broadcasting permits was frozen pending further study of the television broadcasting industry. 1951: A.T. & T. completed a transcontinental microwave transmission system and coast-to-coast television broadcasting was Inaugurated. 1953: Magnetic tape recording for television was developed. 1953: The FCC approved standards for color television. 1965: Color television became an important aspect of television broadcasting. EXHIBIT 74. CHRONOLOGY OF DISCOVERY AND DEVELOPMENT IN TELEVISION BROADCASTING
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