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PIZARRA PERFECCIONADA, caracterizada esencialmente por estar dotada dentro de su marco de un mecanismo presentador de la muestra, integrado por dos tambores que enrollan y desenrollan una cinta en la que van impresas las referidas muestras, que aparecen y desaparecen por la cara principal de la pizarra merced a unas ranuras paralelas, a través de las cuales pasa la cinta.