Summaries of entities may provide additional useful information to user. Receiving a request for data transmission to the mobile station, the radio control apparatus determines whether radio wave transmission and reception are being performed with the mobile station in a communication operation using the first frequency band area. The tool-support can be secured on the machine frame or housing in such a way that it can be swivelled about the grinding-disc shaft or about a swivel axis parallel to the grinding-disc shaft and can be arrested by way of the arresting apparatus in a plurality of angular positions. A first end of a springy, forwardly bowed clamping bar is hinged to the first recurved end and positioned behind the support bar. Each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states. One aspect of the invention involves obtaining information concerning respiration and heart function.