The invention relates to a positioning structure of a frame with a bulb assembly, which utilizes a positioning structure provided on the frame and the bulb holder of the bulb assembly for easily engaging both firmly. When the machine, of which a bearing is a component, is operated, a flexible flinger disc provides proper lubrication by disturbance of the lubricant. 5 T and electron acceleration energy of 0. A machine-signature database, configured to store multiple machine signatures andor machine-signature templates, may receive and process queries about machine signatures for machine identification. This design provides for more precise placement and post-procedural visualization in a vessel, by increasing the radiopacity of the stent under X-ray fluoroscopy. The light projection apparatus includes a fluorescent member which is excited with exciting light and a light projecting member which reflects or transmits the light emanating from the fluorescent member to project it outside.