. "American inventor and film maker" . . . "1940-09-07Z"^^ . . "Leon Forrest Douglass"@en . "Douglass, Leon Forrest"@en . . . "1869-03-12Z"^^ . "Douglass, Leon"@en . "1940Z"^^ . . "Leon Forrest Douglass (March 12, 1869 \u2013 September 7, 1940) was an American inventor and co-founder of the Victor Talking Machine Company who registered approximately fifty patents, mostly for film and sound recording techniques."@en . "1869Z"^^ .