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Where was RADAR invented?

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Various countries claim to have been the first to have invented it, and in the 1930s a number of countries were working on radar for military purposes. Robert Watson-Watts (1892-1973) is widely regarded as the inventor of a large-scale practical system, which he patented in April 1935 (British patent). He played a key role in setting up an early warning system, round Britain, of approaching enemy aircraft.
At the same time the British government also experimented with detection and ranging ('distancing') by heat from aircraft engines. However, it became obvious that detection by heat still needed many years of research and development, whereas radar didn't.
The basic idea of sending out a beam and picking up its 'reflection' or return is much older.
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