In a projection video display system, display devices are irradiated with light emitted from a light source 1 housed in a body case, and a video image is projected to the outside of the body case. The stage is a finishing station having a sharpening member in the form of a disc which comprises a rigid support having a flexible abrasive matrix which both sharpens and polishes the facet of the ceramic blade. The fluid is super saturated by adjusting pressure in the vessel. Where this condition is satisfied, the proper tuning voltage has been acquired. host disease, arthritis, rheumatoid arthritis, inflammatory bowel disease, atopic dermatitis, psoriasis, asthma, allergies or multiple sclerosis.