Objects of the present invention are to provide a novel niobium or tantalum complex having good vapor pressure and becoming a raw material for producing a niobium- or tantalum-containing thin film by a method such as CVD method, ALD method or the like, a method for producing the same, a metal-containing thin film using the same, and a method for producing the same. The product consists of >60% ww of oligomerspolymers with at least two alkoxylated amine units and one or more diacidacid anhydride unit or >50% ww of oligomerspolymers with at least two alkoxylated amine units and two or more diacidacid anhydride units; as a corrosion inhibitor for metal surfaces. The display layer is sandwiched between the display array substrate and the common-electrode substrate. The switch has a trigger receiver. The lever is pivotably attached to the edge of the top cover. The method includes accepting a first location of a user from a first system, accepting a second location of the user from a second system and processing the first and second location so as to detect a violation of a predefined rule specifying a legitimate relationship between the first and second locations.