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Category:Sikorsky S-69

English: The Sikorsky S-69 was an experimental compound co-axial helicopter developed as part of the Advancing Blade Concept (ABC) program in the 1970ies.
Sikorsky S-69 
XH-59A helicopter in 1981 (3).JPEG
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Media in category "Sikorsky S-69"

The following 4 files are in this category, out of 4 total.