Abstract: A magneto-optical recording medium, which comprises a thin film constituted of an amorphous alloy (R.sub.x TM.sub.1-x).sub.1-y A.sub.y (where the element material R is at least one rare earth element, the element material TM at least one 3d transition metal and the element material A at least one semi-metal-semiconductor element) and having an easy axis of magnetization in a direction perpendicular to the film surface, the atomic ratio being 0.15.ltoreq.xx.ltoreq.0.35 and 0.00<y.ltoreq.0.20.

Abstract: An exposure time setting device is provided for effecting the exposure time for the shutter in response to the dial position of an exposure time setting dial disposed on an upper surface of a camera and movable in an operating plane. The device is provided with a control mechanism movable in a given plane perpendicular to the operating plane for opening and closing the shutter, a governor mechanism movable in the given plane for delaying operation of the control mechanism and an exposure time setting cam movable, in response to movement of the dial, within a plane parallel to the operating plane and perpendicular to the given plane.

Abstract: In a control system installed on a motor vehicle and constituted of an oxygen concentration sensor and a control device for regulating the fuel supply rate to apparatus for preparing an air-fuel mixture on the basis of a signal from the sensor, a compensation circuit is inserted between the sensor and the control device, a resistance in which circuit varies as the engine is run every predetermined hours or the vehicle travels every predetermined distance.