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The de Bothezat helicopter was a landmark aircraft for many reasons not least because it was the U.S. Army’s first attempt at bringing rotary-wing flight into its arsenal.

New yorkUnited statesSaint petersburgSankt peterburgMassachusetts institute of technologyColumbia universityIvan jeromeLe rhoneMasonm patrickBart smithFranklino carrolBothezat impeller companyArmy air servicesScrew research syndicateResearch section at mccook fieldArmy air service