Abstract: An electrical switch capable of emitting light is composed of a base, a conductive disk, a switching conductive piece, a first and a second fastening conductive pieces, a cap, a rotating mechanism, and a light-emitting diode. The conductive disk is located in a receiving cell of the base such that the conductive disk is fastened with the switching conductive piece. The first and the second fastening conductive pieces are connected with an electrical device. The cap is pervious to light and is joined with the base. The rotating mechanism is composed of a rotary piece and a link column. The light-emitting element is connected with the first and the second fastening conductive pieces which can be connected or disconnected with the switching conductive piece by triggering the link column to actuate the rotary piece capable of driving the conductive disk.

Abstract: A control system for a pair of hydraulic lift actuators for adjusting the position of a blade-carrying frame of a motor grader includes a pair of control levers respectively operatively connected to a pair of direction control valves which are, in turn, respectively connected to the pair of actuators and selectively operable by means of the levers to place the actuators in neutral, extension, retraction, and float conditions. Each of the levers includes a hollow handle section having an electric switch mounted therein and a finger-operable sleeve is reciprocably mounted on the handle section for selectively closing the switch. Each switch is connected to an electrically responsive portion of a respective one of the control valves and when closed causes the valve to shift to effect the float condition in an associated one of the actuators.