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who invented the first traffic light. There are any references about who invented the first traffic light in here. you can look below.
who invented the first traffic light
who invented the first traffic light signal
when was the first traffic light invented
who invented the first electric traffic light
where was the first traffic light invented
first traffic light invented
who invented the first traffic light, who invented the first traffic light signal, when was the first traffic light invented, who invented the first electric traffic light, where was the first traffic light invented, first traffic light invented
