A water soluble bactericide is obtained by ozone-oxidizing glyceline. While passengers board the aircraft, the seating and treadmill exercise device may be placed in the stowed position to allow passengers to freely move about the aircraft cabin. The device also includes a second housing part, which is movable relative to the first housing part and has an actuating part for acting on the valve to actuate the valve for administration of the sprayable substance. The center frequencies of the respective convex group delay circuits are set to be different from each other so that the overall group delay characteristic of the in-band group delay equalizer becomes flat.