 Guillermo González Camarena built his own monochromatic camera in 1934, and in 1940 he developed the first trichromatic system and obtained the first patent for color television in the world.After developing radio and television stations, in 1948, he built the studio Gon-Cam, which was considered the best television system in the world in the time, according to survey conducted by the Columbia College of Chicago.With the passage of the century, the television broadcasting market became dominated by two powerful companies, Televisa—the largest Spanish media company in the Spanish-speaking world — and Azteca, even though several dozen regional networks operate in the country.