Julius Bau (1833-1915) was a mayor in Mülheim am Rhein. It is said that Mr. Bau, together with Montanus and a companion from Schlebusch, who could whistle loud and penetrating with his fingers, were ejected from a meeting of democrats ... (year unknown)

Source: "Mülheim am Rhein" von Inge Prass, Stadtgeschichte in Straßennamen" 1988