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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)

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The Evolution of Sign Language

ByDavid Heineman

5 nov 2017

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633

Data:

8 sett 1620 anni

8 sett 1720 anni

~ 100 years

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