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Nueva escala graduada caracterizada por que en el cuerpo de una regla de sección trapezoidal, se dispone una graduación de diez o más divisiones idénticas, con medida determinada en milímetros y en el orden de 10-0-10-20-30-40-50-60-70-80-90 y así sucesivamente; la división correspondiente al extremo izquierdo o derecho, llamada contra escala, va subdividida en centímetros y milímetros de la escala elegida, quedando las restantes sin esta subdivisión.