Invention of Gas Mask and Thre light Traffic Lights (Signal) by Garrett Morgan in 1923
In 1914, Garrett Morgan patented a breathing device in the form of a canvas hood—a precursor to the modern gas mask. … Garrett Morgan ...
In 1914, Garrett Morgan patented a breathing device in the form of a canvas hood—a precursor to the modern gas mask. … Garrett Morgan ...
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