 On November 1, 1970, the first permanent civil air ambulance helicopter, "Christoph 1", entered service at the Hospital of Harlaching, Munich, Germany.The apparent success of "Christoph 1" led to a quick expansion of the concept across Germany, with "Christoph 10" entering service in 1975, "Christoph 20" in 1981, and "Christoph 51" in 1989.As of 2007, there are about 80 helicopters named after Saint Christopher, like "Christoph Europa 5" (also serving Denmark), "Christoph Brandenburg" or "Christoph Murnau am Staffelsee".