File:Pedrail wheel (Wonders of Mechanical Ingenuity, 1911).jpg
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![File:Pedrail wheel (Wonders of Mechanical Ingenuity, 1911).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Pedrail_wheel_%28Wonders_of_Mechanical_Ingenuity%2C_1911%29.jpg/709px-Pedrail_wheel_%28Wonders_of_Mechanical_Ingenuity%2C_1911%29.jpg?20130612225006)
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