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Máquinas despedregadora, caracterizada porque consta de un bastidor sustancialmente rectangular dotado en su parte anterior de una lanza de arrastre abatible con inclinación gobernable por medio de una pieza articulada sobre la lanza y dotada de orificios para aplicación de un pasador por el que queda referida a un brazo filo a la parte delantera del soporte rectangular y porque en esta misma parte delantera comporta en vertical un manguito roscado interiormente por el que se desplaza por accionamiento manual un husillo para su apoyo gobernado, contra el suelo.