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November 20, 1923 - Garrett Morgan patents three position traffic light
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This Day In History: Garrett Morgan Patents The Traffic Signal
Who Invented The Traffic Light And What Year | Shelly Lighting
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Red, Yellow, Green: Some D.C. Traffic Light History - Ghosts of DC
Who Invented The First Traffic Light And What Year | Shelly Lighting
November 20, 1923 - Garrett Morgan patents three position traffic light
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