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Sign language was used by the deaf, but wasn't widely used and varied between people. A larger use was for secret communication (8 sett 1620 anni – 8 sett 1720 anni)
Aggiunto al nastro di tempo:
The Evolution of Sign Language
By
David Heineman
5 nov 2017
0
0
472
Data:
8 sett 1620 anni
8 sett 1720 anni
~ 100 years
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