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It was added to the skateboard for better control, it was added by Stevenson.
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The urethane wheel was invented by Frank Nasworthy for better role on a skateboard.
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Instead for roller skate wheels a man named Ronald Bennett created skateboard trunks fro better turning.
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The new bearings were inovated by the company RoadRider for better riding.
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The skateboard went from free style board to a largely simmertical shape and relativly narrow shape.
