when was the turn signal invented
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when was the turn signal invented
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when were car turn signals invented
when did turn signals become standard
when was the traffic signal invented
history of turn signals on cars
when were turn signals added to cars
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facts about turn signal usage
what is a turn signal
when did turn signals become mandatory
turn signal before turning
first turn signals on cars
when was the turn signal invented, who invented the turn signal, who invented the turn signal in cars, who invented the car turn signal, when were car turn signals invented, when did turn signals become standard, when was the traffic signal invented, history of turn signals on cars, when were turn signals added to cars, vintage turn signal for cars, when did cars get turn signals, facts about turn signal usage, what is a turn signal, when did turn signals become mandatory, turn signal before turning, first turn signals on cars
