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https://www.md80.it/2013/02/28/sikorsky-e-boeing-propongono-l-x2-technology-helicopter-design-per-il-programma-jmr-future-vertical-lift-dell-us-army/
SIKORSKY E BOEING PROPONGONO L' X2 TECHNOLOGY HELICOPTER DESIGN PER IL PROGRAMMA JMR FUTURE VERTICAL LIFT DELL' U.S. ARMY