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Mejoras introducidas en el objeto de la Patente principal núm. 412.704 por: Máquina afiladora, caracterizada porque la placa que sirve de apoyo a la banda abrasiva, cuando se afila un útil, es independiente de la horquilla soporte del tambor arrastrado y un extremo presenta un pliegue a escuadra, dotado de un orificio, de manera que dicha placa pueda ser solidarizada al conjunto por medio del tornillo que une dicha horquilla al sistema extensible de la máquina, intercalando una arandela elástica.