Category:AI Mk. IV radar

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AI Mk. IV radar 
operational model of the world's first air-to-air radar system
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Subclass of airborne interception radar
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AI Mk. IV radar (en); Radar AI Mk. IV (fr) operational model of the world's first air-to-air radar system (en) Airborne Interception radar, Mark IV (en)

AI Mk. IV was the world's first operational airborne fighter radar system. It was used by RAF night fighters from late 1940 until it was replaced by the AI Mk. VIII in 1943.