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In page Carlota O'Neill:

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Virgilio Leret had designed a continuous-reaction turbocharger engine.[1] This invention was patented in the Industrial Property Register of Madrid on 28 March 1935, with the number 137,729. The president of the republic, Manuel Azaña, named Leret a professor at the Four Winds School of Mechanics and commissioned Hispano-Suiza Aviation to construct a prototype in September 1936. Leret did not become a teacher and the prototype was not built. Leret's design was at the forefront of aeronautical advances that were registered in Europe.[citation needed]