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Televisa started to transmit several programs produced by the Universidad Nacional Autónoma de México in 1977.
Before the launch, Telesistema began airing in color in the late 1950s in select cities along the U.
At the time, both Telesistema and TIM (which was based in Monterrey) competed with another new station, XHDF-TV channel 13, which also started transmissions in 1968.
Over the next four years, both networks competed in content and image until they merged, taking on the name Televisa in 1973.
In the merger deal, the owners of Telesistema had 75 percent of the stocks, while the owners of Televisión Independiente had the rest, which were sold to Telesistema later because of financial problems.
On September 7, 1970, 24 Horas debuted and became one of Mexico's most watched news programs.