Template:Are You Sure/March 25
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... that in 1857, printer, bookseller, and inventor Édouard-Léon Scott de Martinville received a patent for the phonoautograph, which records an audio signal as a photographic image?
... that mathematician and engineer Philbert Maurice d’Ocagne founded the field of nomography, the graphic computation of algebraic equations?
... that chess player, chess writer, codebreaker, and civil servant Philip Stuart Milner-Barry worked at Bletchley Park during World War II, where he was head of "Hut 6", the section responsible for deciphering messages which had been encrypted using the German Enigma machine?