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Posted on @rawstates
Garrett Morgan's inventions
1923
Cleveland, Ohio
CC0 · Wikimedia Commons
The son of freed slaves with a sixth-grade education patented the three-position traffic signal, adding the interval that became yellow, and a smoke hood that he personally used to pull men alive out of a flooded tunnel under Lake Erie in 1916. He had to hire a white actor to demonstrate the hood to southern buyers.
That was 1 of the hidden places.
Location: historic site
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