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Martha's Vineyard Sign Language

Martha's Vineyard Sign Language was a village sign-language that was once widely used on the island of Martha's Vineyard from the early 18th century to 1952. It was used by both deaf and hearing people in the community; consequently, deafness was... Wikipedia
Language family: Sign language
Early forms: Old Kentish Sign Language: Chilmark Sign Language;
Extinct: 1952