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Garett Morgan: A Great Black Inventor – Timedia Zambia
An early type of British gas mask used during WW1 known as a PH helmet
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Cluny MacPherson “Gas Mask” | Canadian Military Medical Museum
Black American Who Invented The Traffic Light | Shelly Lighting
Who invented the Gas Mask? Inventions and Inventors for kids***
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Famous Inventions in 1915 | Bizfluent