William D. Coolidge (nonfiction)

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William David Coolidge.

William David Coolidge (/ˈkuːlɪdʒ/; October 23, 1873 – February 3, 1975)[1] was an American physicist and engineer, who made major contributions to X-ray machines. He was the director of the General Electric Research Laboratory and a vice-president of the corporation. He was also famous for the development of "ductile tungsten", which is important for the incandescent light bulb.

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