There were many, many people involved as the technology evolved from an opto-mechanical device to one entirely electronic from the 1870s through the 1920s In 1925, John Logie Baird made the world's first working television system with a demonstration of his "Televisor" system in London. It was this same system that was put into operation by the BBC in 1929 when they began public television broadcasts for the first time Meanwhile, Philo Farnsworth in America demonstrated the first fully electronic system in 1929. It used electronic scanning of both the pickup and display devices The early inventors were in Europe and the later ones worked in the USA.
The first makings of television were patented in 1884 by a man named Paul Gottlieb Nipkow, throughout the years his ideas were modified into the television we all know now! You can find more information here: en.wikipedia.org/wiki/Television#story.
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