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Sikorsky Ilya Muroments
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Sikorsky Russian Knight biplane
Sikorsky R-4/R-5
Short desc: Sikorsky R-4/R-5
Things in this design:
helicopter
Sikorsky R-4/R-5
This design is used by one stamp:
Nevis 11/28/2007 $3 issue=100th Anniversary of Helicopter wmk=crown & CA perf=13.5
Record of changes
