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Garrett Morgan patents three-position traffic signal | November 20, 1923 | HISTORY
On November 20, 1923, the U.S. Patent Office grants Patent No. 1,475,074 to 46-year-old inventor and newspaperman Garrett Morgan for his three-position traffic signal. Though Morgan’s was not the first traffic signal (that one had been installed in London in 1868), it was an important innovation...
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