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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 (sep 8, 1620 – sep 8, 1720)
Added to timeline:
The Evolution of Sign Language
By
David Heineman
5 Nov 2017
0
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622
Date:
sep 8, 1620
sep 8, 1720
~ 100 years
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