When did Garret Morgan invent the gas mask?

Garret Augustus Morgan, Sr. Received his patent on the gas mask in 1912. He called it the Safety Hood and Smoke Protector.

A more advanced model of his invention won gold medals from the International Exposition of Sanitation and Safety, as well as the International Association of Fire Chiefs. Source:U.S. Department of Transportation: Garret A. Morgan Sr.

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