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Sikorsky S-16 Doppeldecker. Sarapul.
Sikorskij S-16 biplane assembled in Sarapul factory. Public domain photograph of aircraft, free to use, no copyright restrictions image - Picryl description
Sikorskij S-16 biplane assembled in Sarapul factory. Public domain photograph of aircraft, free to use, no copyright restrictions image - Picryl description