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Ventana perfeccionada caracterizada por comprender un marco general fijo, en cuyos extremos dispone de dos marcos fijos provistos de su cristal correspondiente y conformando un hueco aproximadamente igual en longitud, a la suma de los fijos de manera que quede cerrado por dos marcos igualmente acristalados que se deslizan colgados de una U fija por su fondo, por medio de unas ruedas, preferentemente de material moldeable, para un funcionamiento silencioso siendo guiadas en la parte inferior por ruedas análogas fijadas sobre eje vertical, cerrando entre ambas por cremona o cierre analogo que se considere adecuado.