Although best known for inventing the three-color traffic light, Garrett Morgan created another life-saving device - the prototype for gas masks used to protect soldiers in World War 1 - and went to incredible lengths to prove the worth of the device.

Learn more about Morgan's life and work here: https://www.history.com/this-day-in-history/garrett-morgan-patents-three-position-traffic-signal

http://www.pbs.org/wgbh/theymadeamerica/whomade/morgan_hi.html

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