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The Supermarine Spitfire was designed and built by Supermarine.
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Supermarine was the company who built the spitfire. ie: North American P-51 Mustang, Republic P-47 Thunderbolt.
The Spitfire was designed by RJ Mitchell, and built by Supermarine. Many of them were maunfactured in Southampton in Britain.
The Spitfire was designed at Supermarine Aircraft Works, Woolston, Southampton, England.