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Hace 1 día · Juan Pablo Bonet, Reducción de las letras y arte para enseñar a hablar a los mudos ("Reduction of letters and art for teaching mute people to speak") (Madrid, 1620) Groups of deaf people have used sign languages throughout history. One of the earliest written records of a sign language is from the fifth century B.C., in Plato's Cratylus, where Socrates says: "If we hadn't a voice or a tongue ...
