Approximately when was television invented?

Just wondering how many could answer without Googling it.

TV became popular in the early 1950s when cheap TV sets were first sold.

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greenmountaingal · 70-79, F

Vladimir Zworykin invented a cathode ray tube around 1915, I think. This was the forerunner of television. There were TV broadcasts back in the 1930s, but very few people had televisions to receive them.