A miniature cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, the beams of which are manipulated to display images on a phosphorescent screen. From Illustrated News.

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Keywords: -, 20th, beams, black, cathode-ray, century, crt, display, electron, guns, historical, history, illustrated, images, manipulate, miniature, monochrome, news, phosphorescent, screen, tube, vacuum, white