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It was developed by Capt. Edward D. Thalmann, M.D., USN, who did research into decompression theory at the Naval Medical Research Institute, Navy Experimental Diving Unit, the State University of New York at Buffalo and Duke University.
George Döring Ludwig, M.D. (January 4, 1922 – November 24, 1973) was an American professor of medicine and medical researcher noted for developing the first application of ultrasound to the human body for medical purposes, at the Naval Medical Research Institute, Bethesda, Maryland, in the late 1940s.