Semiconductor devices and methods of manufacture thereof are disclosed. The system performs data transmission from a first terminal including N antennas to a second terminal including M antennas using spatially multiplexed streams. The sliding body has a front surface with at least a key and a display and a back surface. At least a third P-type region, of same doping level as the well, is formed on the front surface side in the substrate, and contains at least a fourth N-type region of a doping level lower than 1017 at. The first cables are extended in the seat and secured by the first fastener, and connected with two brake levers. Another separate compressor unit is optionally arranged upstream of an entrance to the fuel cell for a second oxygen-containing fluid stream.