Finger Tip Turn Signals, 1939 Eylül 02, 2023 1930s, humor & hilarious, inventions, traffic & transport In 1939, asked to make a speech on motor safety, Williams invented this signaling device for drivers instead. A dry cell supplies current to light bulbs, one white and the other red, on the fingers. Bunu E-postayla GönderBlogThis!X'te paylaşFacebook'ta Paylaş
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