History of television - Wikipedia
https://en.wikipedia.org/wiki/History_of_television
OverviewTerrestrial televisionMechanical televisionElectronic televisionColor televisionDigital televisionSmart television3D televisionProgramming is broadcast by television stations, sometimes called "channels", as stations are licensed by their governments to broadcast only over assigned channels in the television band. At first, terrestrial broadcasting was the only way television could be widely distributed, and because bandwidth was limited, i.e., there were only a small number of channels available, government regulation …
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