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Letter from Roentgen to Tesla thanking him for photos

July 20th, 1901 letter from Wilhelm Roentgen to Nikola Tesla

July 20th, 1901
Dear Sir! You have surprised me tremendously with the beautiful photographs of wonderful discharges...

June 11, 1931 letter from William S. Lee to Nikola Tesla

June 11th, 1931 letter from William S. Lee to Nikola Tesla

June 11th, 1931
American Institute of Electrical Engineers 33 West Thirty-ninth Street New York William S. Lee,...

June 4th, 1931 letter from W.K. Dunlap to Nikola Tesla

June 4th, 1931 letter from W.K. Dunlap to Nikola Tesla

June 4th, 1931
Westinghouse Electric & Manufacturing Company East Pittsburgh, Pa. Office of W.K. Dunlap Acting...