The first patent for using a gas turbine to power an aircraft was filed in 1921 by Frenchman Maxime Guillaume. ," French patent no. 534,801 (filed: 3 May 1921; issued: 13 January 1922). His engine was to be an axial-flow turbojet, but was never constructed, as it would have required considerable advances over the state of the art in compressors.
- "Propulseur par réaction sur l'air" (in French). Espace.net. 3 April 1922. Retrieved 11 January 2013.
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