A mobile communication system is configured as a mobile station in a first communication state shifts to a second communication state when at least one high speed uplink packet communication compliant radio link is established by the mobile station. The pig station comprises a lid to cover an opening enabling removal of the cleaning pig. Each of the TFTs is arranged in a region directly below one of the pixel electrodes that is different from and adjacent to the pixel electrode to be driven thereby. An interface circuit is connected to the transducer and measures an elapsed time between transmitting the acoustic signal and receiving the reflected signal. A vertex is defined on the tone board at the location where the reed separates from the tone board. This connector might also comprise an adjustable connector that adjustably and fixedly connects the sprocket with respect to the door-supporting frame.