Abstract: A coating material is a coating material used for applying a coating film formed on a coating made of a zinc-containing material formed in contact with a surface of a metal material and is composed of a binder, a first inorganic material, and a second inorganic material. The binder is composed of an organic resin and does not contain metallic zinc and a zinc alloy. The first inorganic material is composed of a sulfate having a solubility lower than 5 g/100 mL with respect to water. The second inorganic material is soluble in water, exhibits alkalinity if dissolved in water, and has a solubility lower than 5 g/100 mL with respect to water.

Abstract: A prosthetic knee joint includes a thigh connection part to be positioned near a thigh part, a lower leg part rotatibly coupled to the thigh connection part, and a power generating, part for generating power using a resistance resulting from rotation of the lower leg part relative to the thigh connection part.

Abstract: A panel driving device rotates a panel structure to vary a tilt thereof or turns the panel structure about a vertical axis, the panel structure including a panel for receiving sunlight, the panel driving device including: a drive source including a rotational portion capable of rotating; and a transmission mechanism including a connection portion connected to the panel structure, and configured to convert a rotational movement of the rotational portion into rotation or turning of the panel structure without converting the rotational movement of the rotational portion into a linear movement, wherein the connection portion is offset from a rotation axis of the rotational portion.