A turbo-molecular pump includes a base 3; a rotor 4 rotatably supported thereon; a stator 400 disposed around the rotor 4; and a tubular casing 2 configured to accommodate the stator 400. A metal oxide layer is formed on inner, top and outer surfaces of the lower electrode as the dielectric layer. The method includes identifying one or more categories of the accessed state of the native application and recommended application resource identifiers based on features of the accessed state. The information management and distribution system can also include a corporate administrator application. According to the invention, the casing of the coil covers at least part of the permanent magnet in such a manner as to secure the permanent magnet to the winding of conductor wire, such that the conductor wire winding and the permanent magnet form a one-piece unitary assembly suitable for being fitted on the core. The first opening and closing member and the second opening and closing member are openable and closable integrally with each other.