The History of Terrorism
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Nature
Matter
Vacuum
Vacuum tubes
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Vacuum tube
Parents
Vacuum
Children
1891-Today Philips (Euronext Amsterdam: PHIA, NYSE: PHG)
1919-1987 RCA
1922-2020 Raytheon Company (NYSE: RTN)
1937-Today Klystron
Barkhausen-Kurz tube
Charles Litton Sr.
Frederick Terman
Krytrons (high-speed electronic switches)
Sylvania Electric Products
Vacuum tube from $50 each to $5 by WW1 thanks to the US Navy. This is what helped to develop radio.
William Crookes