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Sign language and its alphabet are standardized to what they are today, where every word in English could be said in sign language (15 jun 1720 año – 15 jun 2018 año)
Añadido al timeline:
The Evolution of Sign Language
By
David Heineman
5 nov 2017
0
0
470
fecha:
15 jun 1720 año
15 jun 2018 año
~ 298 years
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