Who Invented the Gas Mask? The Traffic Light? Garrett Morgan: Inventor

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I read an article about him and won black history month award for my research in school

How did Garrett Morgan "invent" the traffic light when JP Knight's traffic lights were operating in London 9 years before Morgan was even born? Lester Wire and James Hoge both had electric traffic lights in operation a decade before Morgan 'invented' his.

How did Garret Morgan "invent" the gas mask in 1914 when a Scotsman called John Stenhouse had already invented it 60 years earlier?