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<p>This paper, based on an invited lecture given at MIT in March 1980, discusses the little-known work of Percy E. Ludgate (1883- 1922), Leonardo Torres y Quevedo (1852- 1936), and Vannevar Bush (1890- 1974). These three inventors, who apparently were unaware of one another's existence, were all directly influenced by know/edge of Charles Babbage's Analytical Engine, and each played a significant role in the history of the development of program-controlled computers.</p>

B. Randell, "From Analytical Engine to Electronic Digital Computer: The Contributions of Ludgate, Torres, and Bush," in IEEE Annals of the History of Computing, vol. 4, no. , pp. 327-341, 1982.
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