Federal Theatres (State Theatres), former Court Theatres; since 1918 the responsibility of the Federal Ministry of Education and until 1999 by the federal government authorities.; before 1918 administered by the General Management of Court Theatres. Federal Theatres comprise the Burgtheater and its associate theatre, the Akademietheater, the State Opera and the Volksoper; in 1999 these three theatres were turned into limited liability companies under the management of the holding company Bundestheater-Holding Ges.m.b.H.; the company Service-GmbH is also involved in the administration of the federal theatres, for example, in running the workshops. The Burgtheater-Museum, which was founded in 1929, has been integrated into the Austrian Theatre Museum in Vienna.