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https://www.olderiswiser.com/blogs/the-history-of-24-hour-news#:~:text=The%2024-hour%20news%20cycle%20was%20first%20launched%20on,the%20first%20all-news%20channel%20in%20the%20United%20States.
https://www.quora.com/When-did-24-hour-broadcasting-begin-on-TV-When-did-they-stop-playing-programming-at-night
When the stations stopped signing off overnight, and started full 24 hour broadcasting. They didn’t all do it at the same time, so I can’t tell you a specific year — rather, it was an evolution through the late 1980s and 1990s, with some stations moving to 24-hour schedules earlier than others did.
https://www.olderiswiser.com/blogs/the-history-of-24-hour-news
The 24-hour news cycle was first launched on June 1, 1980 by CNN (Cable News Network) and has since become a worldwide industry trend. CNN was the first television channel to provide 24-hour news coverage, as was the first all-news channel in the United States.
https://www.answers.com/Q/When_did_TV_become_24_hours
https://www.radiodiscussions.com/threads/first-tv-station-to-broadcast-24-hours-a-day.612455/
Sep 28, 2011. #11. I know in New York City Channel 2 WCBS TV was the first station to transmit 24 hours a day but had about an hour or so of a test pattern because their late night movie had various running times. Onec CBS began overnight news Channel 2 was programming 24/7 sometime in 1982.
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