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Cat and Plant
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Usher 1928
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Providence 1990
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WWII Radar

The WL-530 was a late 30s water-cooled vacuum tube with a peak voltage of 15kV. It was used in the SCR-270, one of the first US radar systems of WWII.

The WL-706GY was an early 40s magnetron used in US Navy radar systems in the final years of WWII.