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<p>was a crucial component in the development of short wavelength <a href="page.php?w=radar">radar</a> during <a href="page.php?w=World_War_II">World War II</a>. In 1937&ndash;1940, a multi-cavity magnetron was built by British physicist <a href="page.php?w=John_Randall_%28physicist%29">Sir John Turton Randall, FRSE</a> and coworkers, for the British and American military radar installations in World War II. A higher-powered microwave generator that worked at shorter <a href="page.php?w=wavelength">wavelength</a>s was needed, and in 1940, at the</p><p>
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