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Townes, James Gordon and the ammonia maser
Charles H. Townes (left) and James P. Gordon shown with the second of two microwave amplifiers, or masers, that they built in 1955 with H. J. Zeiger (not shown). Townes shared the 1964 Nobel Prize in Physics for invention of the maser and the description of the laser, which was first built in 1960. (Courtesy the American Physical Society).
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