File:El mundo físico, 1882 "Receptor del sistema Morse-Digney". (4074920090).jpg
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![File:El mundo físico, 1882 "Receptor del sistema Morse-Digney". (4074920090).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/El_mundo_f%C3%ADsico%2C_1882_%22Receptor_del_sistema_Morse-Digney%22._%284074920090%29.jpg/560px-El_mundo_f%C3%ADsico%2C_1882_%22Receptor_del_sistema_Morse-Digney%22._%284074920090%29.jpg?20160922170440)
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