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Or the story of a device that we all take for granted… 1925. Oscar A. Waltz, Jr patents a ‘turn signal’, but it never enters production. 1929. Oscar J. Simler devises a new form of a traffic signal with an array of lights. Arrows denote left and right turns, augmented by a yellow brake light and a red ‘Stop’ lamp. But, alas, it did not catch on.