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Un martillo perfeccionado caracterizado esencialmente por el hecho de que la cabeza portadora de las partes recambiables de percusión tiene su oquedad ocupada parcialmente por una masa móvil formada por pequeñas partículas de una materia pesada que se desplaza en el interior de la oquedad en oposición a la acción de golpeteo para vencer el retroceso originado por la percusión.