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Zworykin’s most critical invention was the first iconoscope camera tube, which he patented in 1923. The key to its success was the fact that its silvered-mica photocathodes stored the charges induced by the image that was focussed on them until the scanning electron beam simultaneously neutralized the charges and modulated itself.
A year after he invented the iconoscope, Zworykin invented the kinescope - a TV picture tube - thus becoming responsible for both the key transmitting and receiving elements of electronic television.