What invention is credited to the Russian born American inventor Vladimir Kosma Zworykin?

What invention is credited to the Russian born American inventor Vladimir Kosma Zworykin? Correct Answer Television

Vladimir Zworykin, in full Vladimir Kosma Zworykin, (born July 29 , 1888, Murom, Russia—died July 29, 1982, Princeton, New Jersey, U.S.), Russian-born American electronic engineer and inventor of the iconoscope and kinescope television systems.
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