Magnetoelectric multilayer composites comprising alternate layers of a bimetal ferrite wherein one of the metals is zinc and a piezoelectric material for facilitating conversion of an electric field into a magnetic field or vice versa. The lowerable car roof portion is stabilized in the lowered position against movements in a horizontal plane by at least one mechanical device engaging the car roof portion and inner walls of the car. The light source is configured to illuminate the transparent zone of the contact surface. A control input is provided for indicating an end of the voice title and the end indicator is recorded onto the control recording portion of the sequential medium sequentially following the recorded voice title in the audio recording portion. The invention can utilize an actuator to raise and lower an antenna. The overall cost of constructing a coal processing plant can be significantly reduced by the arrangement of the processing to terminate in an underground sump.