Igor Ivan 1889-1972
Russian-born American aviation pioneer. He designed (1939) the first successful American helicopter.
Sikorsky Igor Ivan
THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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