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ES32529A1903-09-161903-09-16Un procedimiento especial para utilizar la fuerza de la gravedad y la velocidad por el descenso de los cuerpos.
ExpiredES32529A1
(es)
Un aparato denominado el compositor mecánico que por medio de electroimanes utilizados directamente o como fuerza intermedia sirve para taladrar o impresionar papel para tocar los pianos mecánicamente.