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Mallebrein Ubald
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Mallebrein Ubald
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Un juguete deportivo, caracterizado por estar constituido por tres ruedas de diámetro aproximadamente iguales, situadas en posiciones coaxiales y equiespaciadas, hallándose las ruedas laterales unidas con la central por medio de sendos ejes paralelos al eje de alineación de aquellas, excéntricos y diametralmente opuestos, sobre los que se arriostran de manera que puedan girar libremente unos bloques que constituyen la superficie de apoyo para los pies del usuario.