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Hi,
a Sikorsky medium helicopter project in 1980.
http://www.flightglobal.com/PDFArchive/View/1980/1980%20-%200564.html?search=SIKORSKY%20aircraft%201980
a Sikorsky medium helicopter project in 1980.
http://www.flightglobal.com/PDFArchive/View/1980/1980%20-%200564.html?search=SIKORSKY%20aircraft%201980