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Today in 1923, garrett morgan patented the traffic signal. here's how
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A History of the Traffic Light and How it May Change Again! - DriveSafe
Today In 1923, Garrett Morgan Patented The Traffic Signal. Here's How
Retrobituaries: Garrett Morgan, the Prolific Inventor Behind the 3
Celebrating National Inventors' Day - New Horizon Academy
Garrett Morgan Saves the Day