Pioneering aviation engineer (1889-1972) who developed the first four-engine airplane and the first modern helicopter to be put into widespread use. Matte-finish 7.75 x 10 photo of Sikorsky holding a model helicopter, signed in the lower border in black ink, "I. Sikorsky, Nov. 13, 1970." In fine condition, with a slight brush to the last letter of the signature.
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