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The National Bureau of Standards demonstrated it for the first time at a conference in Nashville, Tennessee in 1971. The first television broadcast was on a PBS station in 1973.

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Closed captioning was first introduced in the early 1970s by the National Bureau of Standards (now the National Institute of Standards and Technology) for select television programs in the United States. It was primarily done for the benefit of deaf and hard-of-hearing viewers.

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Q: Who first started the closed caption shows?
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