結果 : when was the first electric traffic light invented
5:06

The Story and History of the First Traffic Lights

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The First Electric Traffic Light: A Life-Saver

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1:14

Salt Lake City History Minute - The World's First Electric Traffic Signal

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5:12

Invention of the traffic light by Garrett Morgan was in Cleveland in 1923

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6:36

First Electric Traffic Light - This Date in History

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1:51

150 years since the world’s first traffic light – BBC London News

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0:43

First Electric Traffic light - Cleveland, Ohio

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4:00

Garrett Morgan Traffic Light.Black Inventor.Black History Month.Deeper Than Read(Ep.1)

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The Birth of Electric Traffic Signals

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The First Electric Traffic Signal

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World’s First Electric Traffic Signal (America)

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1:33

First Electric Traffic Light was installed

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0:34

Who invented first electric traffic light? | inventions | Quiz #kids #science #shorts #quiz

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0:39

The world's first electric traffic signal

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