|Swedish Sign Language|
|Linguistic classification:||? British Sign
Swedish SL started about 1800. Wittmann (1991) proposes that it descends from British Sign Language. However, other sources state that Swedish SL has no known predecessor. Regardless, Swedish SL in turn gave rise to Portuguese Sign Language (1823) and Finnish Sign Language (1850s), the latter with local admixture; Finnish and Swedish Sign are mutually unintelligible.
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