The credit as to who was the inventor of modern television really comes down to two different people in two different places both working on the same problem at about the same time: Vladimir Kosma Zworykin, a Russian-born American inventor working for Westinghouse, and Philo Taylor Farnsworth, a privately backed farm boy from the state of Utah.
“Zworykin had a patent, but Farnsworth had a picture…”
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Some historians have gone so far as to suggest that Farnsworth and Zworykin should be regarded as "co-inventors." But that conclusion ignores Zworykin's 1930 visit to Farnsworth's lab, where many witnesses heard Zworykin say "I wish that I might have invented it." Moreover, it ignores the conclusion of the patent office, in its 1935 decision in Interference #64,027, which states quite clearly "priority of invention awarded to Farnsworth."
But close examination of the stories beneath the written record reveals a far more compelling story: In fact, there was one inventor of electronic television. Video as we now know it first took root in the mind of Philo T. Farnsworth when he was fourteen years old, and he was the first to successfully demonstrate the principle, in his lab in San Francisco on September 7, 1927. If you need to fix a date on which television was invented, that's the date.