Permanent magnetism and superconductivity, permanent magnetism Siemens, GE, Hitachi. There are a lot of national brands, the more famous are new high benefit, Neusoft ......
Superconducting Siemens, GE, Philips.
Upstairs, upstairs, upstairs students, superconductivity of domestic indeed not installed, you dare to buy ha? There is also the medical industry has been no constant conduction of the equipment, either permanent magnet or superconducting!