Abstract: An indicator lamp unit comprises a number of light-emitting elements, such as LEDs, arranged on the circumference of a disk or arranged in rows on the circumference of a cylinder, and a milk-white lamp case covering the light-emitting elements. A display terminal comprises, in an integral unit, a display, such as a LCD or an ELD, and said indicator lamp unit. The display and an internal CPU are controlled by an external CPU.

Abstract: A waste water treatment apparatus which can discharge cleaned waste water while separating and recovering insoluble granular components such as emulsions contained in various kinds of waste waters and various kinds of industrial waste waters, while minimizing the decrease of permeation flux by an effective separation membrane washing, and a washing method of the apparatus are disclosed. In washing the separation membrane, a passageway for water permeated through the separation membrane is intercepted, and a compressed gas is introduced into at least a waste feeding side of the separation membrane for a predetermined time, thereby flowing a gas liquid mixed liquid.

Abstract: An optical switching module has an optical waveguide substrate mounted on an electronic circuit substrate. According to a first aspect of the invention, the optical waveguide substrate has thin-film heaters, and the electronic circuit substrate has trimmable thick-film resistors for adjusting current fed to the thin-film heaters. According to a second aspect of the invention, the optical switching module also has a pair of fiber pigtails butt-coupled to the optical waveguide substrate. The fiber pigtails are secured to the ends of a supporter, which is attached to a heat sink fastened below the electronic circuit substrate. According to a third aspect of the invention, the optical waveguide substrate is mounted in a depression in the electronic circuit substrate. The invention reduces the size of the optical switching module.