There is provided an optical readingwriting apparatus. The fastening device is integral with the brush carrier and has at least one tapered region. The battery system generates a direct current voltage having a magnitude greater than or equal to a peak value of a desired alternating current voltage. In an exemplary application, a data stream representing two images can be simultaneously processed using the same number of registers as have been required to process a single image. The, connecting piece without thread is of flange type and provided with a flange which protrudes radially outward. The wireless terminal detects the electric field strength of a carrier signal from each base station during at least one back-off period, creates move destination information based on a carrier signal having the greatest electric field strength and the IP address of the currently used base station, and transmits the created Information and IP address to a server.