In a semiconductor device such as a high-frequency power amplifier module, a plurality of amplifying means are formed on a semiconductor chip which is mounted on a main surface of a wiring substrate, and electrodes of the semiconductor chip are electrically connected by wires to electrodes of the wiring substrate. The inexpensive elastic pouch contains disinfectant and is configured to terminate the present epidemic in hospitals by providing a very inexpensive and easily implemented universal device for protecting and swabbing a wide variety of luer systems from bacterial contamination. The second roller 10 is supported so as to be rotatable by bearings 14 arranged at both ends of the second roller 10. In some embodiments the brush holder includes a channel, such that at least a portion of the mounting block is disposed within the channel of the brush holder. There is also provided a sensor system front-end and a relaxation oscillator. The system diffracts an input light source into a multiple light beam pattern, or initially generates a multiple light beam pattern, in which individual beams of the multiple light beam pattern are precisely spaced, corrected, focused and directed through a two axis plane to the target with minimal movement of any components of the optical head assembly.