Sikorsky S-69: Perbedaan antara revisi
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{{Commons category|Sikorsky S-69}}
* [http://www.globalsecurity.org/military/systems/aircraft/h-59.htm Global Security.org Sikorsky XH-59 page]
* [http://www.sikorsky.com/details/0,3036,CLI1_DIV69_ETI2088,00.html Sikorsky X2] {{Webarchive|url=https://web.archive.org/web/20080714064426/http://www.sikorsky.com/details/0,3036,CLI1_DIV69_ETI2088,00.html |date=2008-07-14 }}
* [http://www.flightglobal.com/articles/2007/06/12/214533/x2-marks-the-spot-for-radical-rotor-designs.html "X2 marks the spot for radical rotor designs" FlightGlobal]
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