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Фотографии
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Air International 1976-01 / Fighter A to Z
The S-3 photographed on 8 August 1917 in its ultimate form with raised centre wing, the ducted spinner having been removed.
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Air International 1976-01 / Fighter A to Z
The S-4 during initial trials with wheel undercarriage
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Air International 1976-01 / Fighter A to Z
The S-6 with Lewis guns mounted between fuselage and upper wing.
