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Hi,
a Sikorsky medium helicopter project in 1980.
http://www.flightglobal.com/PDFArchive/View/1980/1980 - 0564.html?search=SIKORSKY aircraft 1980
a Sikorsky medium helicopter project in 1980.
http://www.flightglobal.com/PDFArchive/View/1980/1980 - 0564.html?search=SIKORSKY aircraft 1980
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