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Un nuevo libro mecánico, caracterizado por que está constituido esencialmente por dos pequeñas bobinas o carretes, uno de los cuales contiene una tira de papel continua impresa que se va arrollando sobre el otro carrete de modo semejante a la operación que se realiza en las cámaras fotográficas, estando cubierto dicho mecanismo por una carcasa exterior provista de una ventana por la que aparece el texto impreso, cuya lectura se facilita con la ayuda de una lente de aumento que cubre la ventana citada.
ES0067836U1958-08-071958-08-07Un nuevo libro mecánico
ExpiredES67836Y
(es)