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It's easy to forget with 24 hour news and other web sources, that at one time, TV was the only place you could actually see the news. Back when network television was young, the first shows were only 15 minutes long and everything was either read as copy with an anchor sitting at a desk or off of film - which took a long time to process.
On Wednesday, CBS paid tribute to itself with some vintage footage of the first 30 minute network headline show - the CBS Evening News With Walter Cronkite.
A look back at the first "CBS Evening News" broadcast on its 62nd anniversary
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NBC's Huntley-Brinkley Report expanded to 30 minutes exactly one week later on September 9.
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ABC expanded its supper hour newscast to 30 minutes in January 1967.
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In recent evening news ratings (wk of Aug 18) ABC is still on top with 6.9 million viewers, NBC next with 5.6 and CBS in third at 3.7 million. These are summer numbers naturally and some of the anchors like David Muir on ABC were away on holiday which gave a small dip to the networks rating.