Abstract: A conductive film includes a metal oxide as a main component. The metal oxide contains the same components as components of a compound represented by a formula (I): (AO)2B6O11??(I) where A in the formula (I) is a metal element capable of having a valence of +1 or +2, B in the formula (I) is a transition metal element capable of having a valence of +4 or +5, O in the formula (I) is an oxygen element, and an average valence of B in the formula (I) is less than the maximum oxidation number of B. The metal oxide has a crystal structure in which diffraction peaks in an X-ray diffraction pattern of the metal oxide appear at same diffraction angles as diffraction angles at which diffraction peaks in an X-ray diffraction pattern of the compound represented by the formula (I) appear.

Abstract: A gear spindle device for a rolling mill includes: a spindle outer cylinder having, at a first end side, an inner circumferential surface provided with an inner circumferential gear; a spindle inner cylinder having an outer circumferential surface provided with an outer circumferential gear which engages with the inner circumferential gear; a seal member disposed between the spindle outer cylinder and the spindle inner cylinder, for holding a lubricant oil at an engagement portion between the inner circumferential gear and the outer circumferential gear; and a coolant supply unit disposed at an opposite side to the seal member across the engagement portion in an axial direction of the spindle outer cylinder, for supplying a coolant toward the spindle outer cylinder in a formation region of the engagement portion where the engagement portion is formed.