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They talk about telephone devices that can transmit images as well as sound. Bell's invention of the telephone used light to transmit sound and he wanted to send a picture.
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He used the word "television" for the first time.
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He is the first to transmit moving silhouettes using a mechanical television.
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HDTV (high definition tv) is top notch picture quality. The design is a flat panel screen televsion.
LCD (liquid crystal design) are more energy efficient. -