What are the international anesthesia machine brands

Now with imported brands are Germany Drager (Drager), the United States and Europe and the United States of America (Ohmeda), Germany Helen (HEINEN + LOEWENSTEIN), the United Kingdom Blease (Blease), the British Royal, the United Kingdom climbed the dragon (Penlon), U.S. GE, Germany Woel (Heyer), Germany Steven and so on. Now we also use the Derg, GE-Omida and Blease.