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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 (jun 15, 1720 – jun 15, 2018)
Added to timeline:
The Evolution of Sign Language
By
David Heineman
5 Nov 2017
0
0
622
Date:
jun 15, 1720
jun 15, 2018
~ 298 years
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