Engineer working on the Pescarra Helicopter. Developed by Argentine engineer Raúl Pescara in the early 1920s, it had two contra-rotating 'screws', each having four blades. Ca. 1920s.
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Image Number: 4048-10130Rights ManagedCredit Line:Everett Collection/SuperStockCollection:Everett Collection Model Release:NoProperty Release:NoResolution:3384×2585