?Final Price Realized includes Buyer’s Premium added to Hammer Price
Estimate: $ 1,000 - $ 2,000
THE HELICOPTER(SIKORSKY, IGOR.) United Aircraft Corporation.Patent Specification 551,156 . . . Improvements in or relating to Aircraft.5 plates, all but the last double-page (rehinged with cloth tape). 8 pages. 4to, disbound.<\t>(London, 1943)
First printing of the British patent for Sikorsky's single-rotor helicopter, which became the standard configuration and marked the beginning of practical vertical flight. <
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