Pioneering aviation engineer (1889-1972) who developed the first four-engine airplane and the first modern helicopter to be put into widespread use. TLS signed “I. Sikorsky,” one page, 8.5 x 11, Vought-Sikorsky Aircraft letterhead, November 3, 1942. Letter to John Wood at the Harvard Club in New York, thanking him for "the copy of your book, 'Airports'…which I shall be glad to keep on hand as a valuable source of information and reference." In fine condition, with some light soiling to the bottom edge.
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