Artificial Languages

Esperanto 1887

Idiom Neutral 1902

Ido 1903

Interglossa 1943

Interlingua 1950

Loglan 1955

Niu Tutonish 1906

Novial 1928

Occidental 1922

Pankel ?

Tutonish 1888

Volapuk 1879

Klingon 1985

http://en.wikipedia.org/wiki/Artificial_language