A pour spout device is a unitary construction molded of flexible plastic, including a base cap and an elongated spout tube. A mask layer is formed on the second insulating interlayer, and then the second insulating interlayer, the second conductive layer, and the first insulating interlayer are selectively removed using the mask layer as an etch mask to form a contact hole exposing the first conductive layer. The device binding application determines an order for binding the one or more other devices to the at least one host device. The film thickness of the to be etched film increases as the distance from the exposure region increases, such that the inclination of the outline of the cross section of the to be etched film that exists within the peripheral region decreases as the distance from the exposure region increases. Thermal components, such as, for example, the curved exhaust lines of the exhaust system, can be accommodated in an integrating manner. and a quaternary ammonium base, and exhibits a buffer action in the range from pH8 to pH11.