A circuit for driving a luminous means is provided. At least portions of the main frame, the leg, the link, and the stabilizer form a four bar system for raising and lowering the bed. The coefficient of thermal expansion variation within the encapsulant preferably is less than 30%, due to uniform dispersion of the filler particles within the epoxy. There are two or three electrolytic capacitors of the nonlinear low pass L-C filter diode bridge in preferred embodiments. , by storing information identifying the mobile station may be stored in a location register of the satellite mobile communications system responsive to the registration of the mobile station with the terrestrial mobile communications system, and maintaining synchronization between the two registrations.