Abstract: An aqueous coating composition comprising(A) an acrylic resin emulsion having an average particle diameter of 0.05 to 5, and(B) hydrophilic microparticles having an average diameter of 0.01 to 3, the solid weight ratio of said (A)/(B) being 99/1 to 50/50. The coating composition is excellent in storage stability and capable of forming a coating with excellent moisture permeability, water resistance, flexibility, durability and other desired film properties.

Abstract: An electromagnetic selector valve system having an electrically conductive coil adjacent a moveable core within a valve body. First, second and third valve passages are in communication with the valve body, and biasing means are adapted to bias the reciprocative core to assume a first position wherein the core permits communication only between the first and third passages. Upon energizing the electrically conductive coil, the core assumes a second position which permits communication only between the first and second passages. In a preferred embodiment, the electromagnetic selector valve is utilized in order to control the spark advance of an engine.

Abstract: Timing control mechanism for an internal combustion engine employs a vacuum chamber connected to a solenoid valve operated by a thermal switch responsive to engine temperature. The solenoid valve connects the vacuum chamber to one of two vacuum outlets connected to the engine intake passage. The first of the outlets is positioned adjacent and upstream from the throttle valve and the second of the outlets is positioned downstream from the throttle valve. The passage from the first outlet to the solenoid valve contains orifice means to restrict flow and also contains a check valve in parallel with the orifice means to permit flow toward the solenoid valve. The passage from the second vacuum outlet contains a check valve preventing flow toward the solenoid valve.