The flugelhorn (—also spelled fluegelhorn, flugel horn, or flügelhorn— from German, wing horn, ) is a brass instrument that resembles a trumpet but has a wider, conical bore. Some consider it a member of the saxhorn family developed by Adolphe Sax (who also developed the saxophone). Other historians assert that it derives from the valve bugle designed by Michael Saurle (father) in Munich in 1832 (Royal Bavarian privilege for a "chromatic Flügelhorn" 1832), which predates Adolphe Sax's work.