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