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It was inventes in France by Nicolas Cugnot. The steam tractor worked by pumping pistons up and down to move the wheels.But the tractor was very heavy and unstable.
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It was invented by George Stephenson and his son Robert in England. The Stephenson's Rocket coeld travel 48kph and won a competition.
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It was invented by Henry Ford in U.S.A. He started producing cars in his factories and in the first 20 years of production 15 million cars were sold.