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английский) 1:
[копия]Скопировано!
on April 17, 1941, Ukrainian avìakonstruktor who emigrated from Kiev to the United States after the February revolution demonstrated to the public the world's first helicopter-amfìbìû. this helicopter was a modification of the well-known "VS-300.Igor Sikorsky-great avìakonstruktor, one of the pioneers of aviation and the inventor of the helicopter.
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