A switch 1 includes a ceramic cylindrical tube 3, first and second end caps 5 and 7 that cover the open end in an axial direction of the ceramic cylindrical tube 3, a movable electrode 9 which slides easily on first end cap 5 and a fixed electrode 11 attached to second end cap 7. The active structure includes grooves that form blocking regions under sourcedrain regions. According to M-LWDF, the weighted delay of the i’th queue is defined as iWici,. They are held well above the plant, borne singly on long stems and in small sprays, and good as cut flowers. The compounds of this invention are useful in treating a variety of diseases including but not limited to depression, anxiety, certain psychiatric symptoms, cognitive impairment and schizophrenia. The upper face part includes a plurality of suction holes through which the ink mist is sucked into an inside of the ink mist collecting mechanism by the suction force of the suction mechanism.